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50-((50*x)/100) = 47.5 // - 47.5
50-((50*x)/100)-47.5 = 0
(-1/2)*x-47.5+50 = 0
2.5-1/2*x = 0 // - 2.5
-1/2*x = -2.5 // : -1/2
x = -2.5/(-1/2)
x = 5
x = 5
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