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(3/4)*x+12 = 5*x // - 5*x
(3/4)*x-(5*x)+12 = 0
(3/4)*x-5*x+12 = 0
12-17/4*x = 0 // - 12
-17/4*x = -12 // : -17/4
x = -12/(-17/4)
x = 48/17
x = 48/17
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