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X in (-oo:+oo)
(3/4)*(X-3) = (5/8)*X // - (5/8)*X
(3/4)*(X-3)-((5/8)*X) = 0
(3/4)*(X-3)+(-5/8)*X = 0
3/4*(X-3)+(-5*X)/8 = 0
(3/4*8*(X-3))/8+(-5*X)/8 = 0
3/4*8*(X-3)-5*X = 0
X-18 = 0
(X-18)/8 = 0
(X-18)/8 = 0 // * 8
X-18 = 0
X-18 = 0 // + 18
X = 18
X = 18
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