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3*x-9 = (3/2)*x // - (3/2)*x
3*x-((3/2)*x)-9 = 0
3*x+(-3/2)*x-9 = 0
3/2*x-9 = 0 // + 9
3/2*x = 9 // : 3/2
x = 9/3/2
x = 6
x = 6
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