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