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3*x-6 = (3*x)/2 // - (3*x)/2
3*x-((3*x)/2)-6 = 0
3*x+(-3/2)*x-6 = 0
3/2*x-6 = 0 // + 6
3/2*x = 6 // : 3/2
x = 6/3/2
x = 4
x = 4
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