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(1/2)*x = (3/4)*x-40 // - (3/4)*x-40
(1/2)*x-((3/4)*x)+40 = 0
(1/2)*x+(-3/4)*x+40 = 0
40-1/4*x = 0 // - 40
-1/4*x = -40 // : -1/4
x = -40/(-1/4)
x = 160
x = 160
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