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(1/2)*x+7.5 = (3/4)*x // - (3/4)*x
(1/2)*x-((3/4)*x)+7.5 = 0
(1/2)*x+(-3/4)*x+7.5 = 0
7.5-1/4*x = 0 // - 7.5
-1/4*x = -7.5 // : -1/4
x = -7.5/(-1/4)
x = 30
x = 30
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