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6x+12-4x+4 = -8
2x+16 = -8
2x = -8-16
2x = -24
x = -12
2. 4x+5(2-x) = 3x-2
4x+10-5x = 3x-2
4x-5x-3x = -2-10
-4x = -12
x = 3
3. 7x-15 = 6(x+2)
7x-15 = 6x+12
7x-6x = 12+15
x = 27
4. 6(1-3x)+2(2x-3) = 0
6-18x+4x-6 = 0
-18x+4x = 6-6
-14x = 0
x = 0
semoga membantu ya :)