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50-(2*x) = (1/2)*x // - (1/2)*x
50-(2*x)-((1/2)*x) = 0
(-1/2)*x-2*x+50 = 0
50-5/2*x = 0 // - 50
-5/2*x = -50 // : -5/2
x = -50/(-5/2)
x = 20
x = 20
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