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(3/4)*x = 18-((1/2)*x) // - 18-((1/2)*x)
(3/4)*x+(1/2)*x-18 = 0
5/4*x-18 = 0 // + 18
5/4*x = 18 // : 5/4
x = 18/5/4
x = 72/5
x = 72/5
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