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2*x-90 = (3/4)*x // - (3/4)*x
2*x-((3/4)*x)-90 = 0
2*x+(-3/4)*x-90 = 0
5/4*x-90 = 0 // + 90
5/4*x = 90 // : 5/4
x = 90/5/4
x = 72
x = 72
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