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0.5*x+7.5 = (3/4)*x // - (3/4)*x
0.5*x-((3/4)*x)+7.5 = 0
0.5*x+(-3/4)*x+7.5 = 0
7.5-0.25*x = 0 // - 7.5
-0.25*x = -7.5 // : -0.25
x = -7.5/(-0.25)
x = 30
x = 30
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