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x-((30*x)/100)-150000 = 75313 // - 75313
x-((30*x)/100)-150000-75313 = 0
x+(-3/10)*x-150000-75313 = 0
7/10*x-225313 = 0 // + 225313
7/10*x = 225313 // : 7/10
x = 225313/7/10
x = 2253130/7
x = 2253130/7
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