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(1/2)*x-(4/8) = (3/4)*x-5 // - (3/4)*x-5
(1/2)*x-((3/4)*x)-(4/8)+5 = 0
(1/2)*x+(-3/4)*x-1/2+5 = 0
9/2-1/4*x = 0 // - 9/2
-1/4*x = -9/2 // : -1/4
x = -9/2/(-1/4)
x = 18
x = 18
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