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(1/4)*x-3 = (1/2)*x-8 // - (1/2)*x-8
(1/4)*x-((1/2)*x)-3+8 = 0
(1/4)*x+(-1/2)*x-3+8 = 0
5-1/4*x = 0 // - 5
-1/4*x = -5 // : -1/4
x = -5/(-1/4)
x = 20
x = 20
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