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50-((1/2)*x)-((5/2)*x) = 75 // - 75
50-((1/2)*x)-((5/2)*x)-75 = 0
(-1/2)*x+(-5/2)*x-75+50 = 0
-3*x-25 = 0 // + 25
-3*x = 25 // : -3
x = 25/(-3)
x = -25/3
x = -25/3
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