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3*x-x-(3/4) = 18 // - 18
3*x-x-(3/4)-18 = 0
3*x-x-3/4-18 = 0
2*x-75/4 = 0 // + 75/4
2*x = 75/4 // : 2
x = 75/4/2
x = 75/8
x = 75/8
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