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x/2+6 = 3*x+x/2-12 // - 3*x+x/2-12
x/2-(3*x)-(x/2)+6+12 = 0
x/2-3*x-(x/2)+6+12 = 0
18-3*x = 0 // - 18
-3*x = -18 // : -3
x = -18/(-3)
x = 6
x = 6
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