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x/2-((5*x)/7) = (3*x)/4+54 // - (3*x)/4+54
x/2-((5*x)/7)-((3*x)/4)-54 = 0
x/2+(-5/7)*x+(-3/4)*x-54 = 0
-27/28*x-54 = 0 // + 54
-27/28*x = 54 // : -27/28
x = 54/(-27/28)
x = -56
x = -56
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