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(3/4)*x-((5/4)*x) = -12 // + 12
(3/4)*x-((5/4)*x)+12 = 0
(3/4)*x+(-5/4)*x+12 = 0
12-1/2*x = 0 // - 12
-1/2*x = -12 // : -1/2
x = -12/(-1/2)
x = 24
x = 24
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