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4x - 7 = -6
4x = -6 + 7
4x = 1
x = 1/4
no.2
12 - 5x = 10
-5x = 10-12
-5x = -2
5x = 2
x = 2/5
no.3
2x - 7 = 8 - 3x
2x + 3x = 8 + 7
5x = 15
x = 3
no.4
6 - 3a = 4a - 8
-3a - 4a = -8 -6
-7a = -14
a = -14/-7
a = 2