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(1/4)*x = (1/2)*x-9 // - (1/2)*x-9
(1/4)*x-((1/2)*x)+9 = 0
(1/4)*x+(-1/2)*x+9 = 0
9-1/4*x = 0 // - 9
-1/4*x = -9 // : -1/4
x = -9/(-1/4)
x = 36
x = 36
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