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50 = (100*x)/18 // - (100*x)/18
50-((100*x)/18) = 0
(-50/9)*x+50 = 0
50-50/9*x = 0 // - 50
-50/9*x = -50 // : -50/9
x = -50/(-50/9)
x = 9
x = 9
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