| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 6 | p | + | 6 | × | 5 | q | + | 6 | × | 5 | + | 8 | × | 9 | p | − | 8 | × | 8 | q | + | 8 | × | 4 | = | 78 | p | − | 34 | q | + | 62 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| (3) | | | | | | | | | | | | | | | | | | | | | | | | | 2 | ( | 8 | x | + | 7 | y | − | 9 | ) | − | 10 | ( | 8 | x | + | 4 | y | + | 10 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 2 | × | 8 | x | + | 2 | × | 7 | y | − | 2 | × | 9 | − | 10 | × | 8 | x | − | 10 | × | 4 | y | − | 10 | × | 10 | = | −64 | x | − | 26 | y | − | 118 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 10 | a | − | 10 | × | 5 | b | − | 10 | × | 7 | a | − | 10 | × | 7 | b | = | −60 | a | − | 120 | b | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 7 | × | 8 | a | − | 7 | × | 9 | + | 3 | × | 8 | a | + | 3 | × | 4 | = | 80 | a | − | 51 | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| (6) | | | | | | | | | | | | | | | | | | | | | | | | | 6 | ( | 6 | x | + | 5 | y | + | 10 | ) | − | 10 | ( | 2 | x | − | 3 | y | + | 2 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 6 | × | 6 | x | + | 6 | × | 5 | y | + | 6 | × | 10 | − | 10 | × | 2 | x | + | 10 | × | 3 | y | − | 10 | × | 2 | = | 16 | x | + | 60 | y | + | 40 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 6 | × | 9 | u | + | 6 | × | 6 | + | 9 | × | 3 | u | + | 9 | × | 6 | = | 81 | u | + | 90 | | | | | | | | | | | | | | | | | | | | | | | | | | |
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