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(3/4)*x+5/4 = 50 // - 50
(3/4)*x+5/4-50 = 0
3/4*x-195/4 = 0 // + 195/4
3/4*x = 195/4 // : 3/4
x = 195/4/3/4
x = 65
x = 65
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