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x-140 = (30/100)*x // - (30/100)*x
x-((30/100)*x)-140 = 0
x+(-3/10)*x-140 = 0
7/10*x-140 = 0 // + 140
7/10*x = 140 // : 7/10
x = 140/7/10
x = 200
x = 200
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