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(1/4)*x-18 = (1/2)*x-6 // - (1/2)*x-6
(1/4)*x-((1/2)*x)-18+6 = 0
(1/4)*x+(-1/2)*x-18+6 = 0
-1/4*x-12 = 0 // + 12
-1/4*x = 12 // : -1/4
x = 12/(-1/4)
x = -48
x = -48
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