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9*(5-(3*x)) = (1/2)*(x+4) // - (1/2)*(x+4)
9*(5-(3*x))-((1/2)*(x+4)) = 0
9*(5-3*x)+(-1/2)*(x+4) = 0
9*(5-3*x)-1/2*(x+4) = 0
9*(5-3*x)-1/2*(x+4) = 0
43-55/2*x = 0
43-55/2*x = 0
43-55/2*x = 0 // - 43
-55/2*x = -43 // : -55/2
x = -43/(-55/2)
x = 86/55
x = 86/55
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