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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
[0E7-00]
(1)
5
x
−
7
=
−21
2
(2)
6
x
+
8
5
=
−
8
4
(3)
7
x
+
9
22
=
6
3
(4)
9
x
−
6
=
−13
6
(5)
10
x
+
10
=
−16
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
x
−
7
=
−21
2
5
x
−
7
=
−42
5
x
=
−42
+
7
x
=
−7
(2)
6
x
+
8
5
=
−
8
4
6
x
+
8
=
−10
6
x
=
−10
−
8
x
=
−3
(3)
7
x
+
9
22
=
6
3
7
x
+
9
=
44
7
x
=
44
−
9
x
=
5
(4)
9
x
−
6
=
−13
6
9
x
−
6
=
−78
9
x
=
−78
+
6
x
=
−8
(5)
10
x
+
10
=
−16
5
10
x
+
10
=
−80
10
x
=
−80
−
10
x
=
−9