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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
54-27/28*x = 0 // - 54
-27/28*x = -54 // : -27/28
x = -54/(-27/28)
x = 56
x = 56
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