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x + 6 + 6= 4x - 6 + 6
x + 12 = 4x
x-x + 12 = 4x -x
12 = 3x
x = 12/3 = 4
maka x-4 adalah
4-4 = 0
-3x=-12
x=4
nilai x-4
4-4= 0