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((30*x)/50)*y = 100 // - 100
((30*x)/50)*y-100 = 0
3/5*x*y-100 = 0 // + 100
3/5*x*y = 100 // : 3/5*y
x = 100/(3/5*y)
x = 500/3*y^-1
x = 500/3*y^-1
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