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(4) | | | | | | | | | | | | | | | | | | | | | | | | 8 | ( | 9 | x | + | 3 | y | − | 7 | ) | − | 8 | ( | 7 | x | + | 7 | y | + | 5 | ) | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 8 | × | 9 | x | + | 8 | × | 3 | y | − | 8 | × | 7 | − | 8 | × | 7 | x | − | 8 | × | 7 | y | − | 8 | × | 5 | = | 16 | x | − | 32 | y | − | 96 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | = | 6 | × | 9 | u | + | 6 | × | 6 | v | − | 5 | × | 7 | u | − | 5 | v | = | 19 | u | + | 31 | v | | | | | | | | | | | | | | | | | | | | | | | | | | |
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(6) | | | | | | | | | | | | | | | | | | | | | | | | 6 | ( | 6 | u | − | 8 | v | − | 5 | ) | + | 8 | ( | 2 | u | + | 6 | v | + | 9 | ) | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 6 | × | 6 | u | − | 6 | × | 8 | v | − | 6 | × | 5 | + | 8 | × | 2 | u | + | 8 | × | 6 | v | + | 8 | × | 9 | = | 52 | u | + | 42 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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(7) | | | | | | | | | | | | | | | | | | | | | | | | 4 | ( | 10 | a | + | 8 | b | + | 5 | ) | + | 5 | ( | 4 | a | + | 10 | b | + | 3 | ) | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 4 | × | 10 | a | + | 4 | × | 8 | b | + | 4 | × | 5 | + | 5 | × | 4 | a | + | 5 | × | 10 | b | + | 5 | × | 3 | = | 60 | a | + | 82 | b | + | 35 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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