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(3*x)/4+(7*x)/2 = 18 // - 18
(3*x)/4+(7*x)/2-18 = 0
17/4*x-18 = 0 // + 18
17/4*x = 18 // : 17/4
x = 18/17/4
x = 72/17
x = 72/17
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