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12x - 24 - 7x + 6 = -2x + 12 + 4x
5x - 18 = 2x + 12
5x - 2x = 12 + 18
3x = 30
x = 30/3
x = 10
2.)
-9x + 18 + 6 + 6x = 7x - 6x - 8
-3x + 24 = x - 8
-3x - x = -8 - 24
-4x = - 32
x = -32/-4
x = 8
3.)
6x + 12 + 16 = -5x - 30 + 2 - 5x
6x + 28 = -10x - 28
6x + 10x = -28 - 28
16x = -56
x = -56/16
x = -7/2
4.)
7x - 10x - 15 = 4 - 2x - 6
-3x - 15 = -2x - 2
-3x + 2x = -2 + 15
-x = 13
x = -13
Maaf, kalau ada yang salah.