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1.5*x-12 = (3*x)/4 // - (3*x)/4
1.5*x-((3*x)/4)-12 = 0
1.5*x+(-3/4)*x-12 = 0
0.75*x-12 = 0 // + 12
0.75*x = 12 // : 0.75
x = 12/0.75
x = 16
x = 16
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