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3*x-3 = (3/4)*(2*x+12) // - (3/4)*(2*x+12)
3*x-((3/4)*(2*x+12))-3 = 0
(-3/4)*(2*x+12)+3*x-3 = 0
3*x-3/4*(2*x+12)-3 = 0
3*x-3/4*(2*x+12)-3 = 0
3/2*x-9-3 = 0
3/2*x-12 = 0
3/2*x-12 = 0
3/2*x-12 = 0 // + 12
3/2*x = 12 // : 3/2
x = 12/3/2
x = 8
x = 8
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