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4(3x - 6) - 7x + 6 = -2(x - 6) + 4x
12x - 24 - 7x + 6 = -2x + 12 + 4x
(12x - 7x) -24 + 6= (-2x + 4x) + 12
5x - 18 = 2x + 12
5x - 2x = 18 + 12
3x = 30
x = 30/3
x = 10
Soal B
-9(x - 2) + 6 + 6x = 7x - 2(3x + 4)
-9x + 18 + 6 + 6x = 7x - 6x -8
(-9x + 6x) + 18 + 6= x - 8
-3x + 24 = x - 8
-3x - x = -8 - 24
-4x = -32
x = -32/-4
x = 8
Soal C
7x - 5(2x + 3) = 4 - (2x+6)
7x - 10x - 15 = 4 - 2x - 6
-3x - 15 = (4 - 6) - 2x
-3x - 15 = -2 - 2x
-3x + 2x= -2 +15
-x = 13
x = -13