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7-((3/4)*x) = (1/2)*x-((1/2)*x)-3 // - (1/2)*x-((1/2)*x)-3
(1/2)*x-((3/4)*x)-((1/2)*x)+3+7 = 0
(-3/4)*x+(-1/2)*x+(1/2)*x+3+7 = 0
10-3/4*x = 0 // - 10
-3/4*x = -10 // : -3/4
x = -10/(-3/4)
x = 40/3
x = 40/3
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