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(1/4)*x-1 = (1/2)*x-8 // - (1/2)*x-8
(1/4)*x-((1/2)*x)-1+8 = 0
(1/4)*x+(-1/2)*x-1+8 = 0
7-1/4*x = 0 // - 7
-1/4*x = -7 // : -1/4
x = -7/(-1/4)
x = 28
x = 28
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