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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[0E4-00]
(1)
2
+
7
x
+
4
x
=
3
x
−
30
(2)
−7
x
+
8
x
−
3
=
3
x
−
5
(3)
−3
x
+
8
=
5
x
−
97
+
7
x
(4)
−10
+
6
x
=
−8
x
+
8
x
−
40
(5)
−7
x
−
3
−
5
x
=
7
x
−
117
(6)
−3
−
8
x
=
−4
x
+
8
x
+
57
(7)
2
x
+
9
+
5
x
=
9
x
+
21
(8)
−6
+
2
x
−
7
x
=
5
x
−
96
(9)
9
x
+
1
=
−9
x
−
6
x
−
167
(10)
3
x
+
9
+
5
x
=
−10
x
−
27
(11)
−8
x
−
5
=
−8
x
−
9
x
+
22
(12)
−1
+
5
x
=
−5
x
−
2
x
+
35
(13)
10
−
5
x
+
5
x
=
10
x
+
90
(14)
6
x
−
10
=
−4
x
+
6
x
+
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
+
7
x
+
4
x
=
3
x
−
30
7
x
+
4
x
−
3
x
=
−30
−
2
x
=
−32
÷
8
x
=
−4
(2)
−7
x
+
8
x
−
3
=
3
x
−
5
−7
x
+
8
x
−
3
x
=
−5
+
3
x
=
−2
÷
(
−2
)
x
=
1
(3)
−3
x
+
8
=
5
x
−
97
+
7
x
−3
x
−
5
x
−
7
x
=
−97
−
8
x
=
−105
÷
(
−15
)
x
=
7
(4)
−10
+
6
x
=
−8
x
+
8
x
−
40
6
x
+
8
x
−
8
x
=
−
40
+
10
x
=
−30
÷
6
x
=
−5
(5)
−7
x
−
3
−
5
x
=
7
x
−
117
−7
x
−
5
x
−
7
x
=
−
117
+
3
x
=
−114
÷
(
−19
)
x
=
6
(6)
−3
−
8
x
=
−4
x
+
8
x
+
57
−8
x
+
4
x
−
8
x
=
57
+
3
x
=
60
÷
(
−12
)
x
=
−5
(7)
2
x
+
9
+
5
x
=
9
x
+
21
2
x
+
5
x
−
9
x
=
21
−
9
x
=
12
÷
(
−2
)
x
=
−6
(8)
−6
+
2
x
−
7
x
=
5
x
−
96
2
x
−
7
x
−
5
x
=
−96
+
6
x
=
−90
÷
(
−10
)
x
=
9
(9)
9
x
+
1
=
−9
x
−
6
x
−
167
9
x
+
9
x
+
6
x
=
−
167
−
1
x
=
−168
÷
24
x
=
−7
(10)
3
x
+
9
+
5
x
=
−10
x
−
27
3
x
+
5
x
+
10
x
=
−
27
−
9
x
=
−36
÷
18
x
=
−2
(11)
−8
x
−
5
=
−8
x
−
9
x
+
22
−8
x
+
8
x
+
9
x
=
22
+
5
x
=
27
÷
9
x
=
3
(12)
−1
+
5
x
=
−5
x
−
2
x
+
35
5
x
+
5
x
+
2
x
=
35
+
1
x
=
36
÷
12
x
=
3
(13)
10
−
5
x
+
5
x
=
10
x
+
90
−5
x
+
5
x
−
10
x
=
90
−
10
x
=
80
÷
(
−10
)
x
=
−8
(14)
6
x
−
10
=
−4
x
+
6
x
+
2
6
x
+
4
x
−
6
x
=
2
+
10
x
=
12
÷
4
x
=
3