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(3*5*x)/4 = 3*x-30 // - 3*x-30
(3*5*x)/4-(3*x)+30 = 0
(3*5*x)/4-3*x+30 = 0
3/4*x+30 = 0 // - 30
3/4*x = -30 // : 3/4
x = -30/3/4
x = -40
x = -40
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