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60/100 = x/(4/5) // - x/(4/5)
60/100-(x/(4/5)) = 0
(-5/4)*x+60/100 = 0
3/5-5/4*x = 0 // - 3/5
-5/4*x = -3/5 // : -5/4
x = -3/5/(-5/4)
x = 12/25
x = 12/25
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