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3*x-(12/4) = 6*x-39 // - 6*x-39
3*x-(6*x)-(12/4)+39 = 0
3*x-6*x-3+39 = 0
36-3*x = 0 // - 36
-3*x = -36 // : -3
x = -36/(-3)
x = 12
x = 12
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