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x in (-oo:+oo)
x/750 = 20/100 // - 20/100
x/750-(20/100) = 0
x/750-1/5 = 0
1/750*x-1/5 = 0 // + 1/5
1/750*x = 1/5 // : 1/750
x = 1/5/1/750
x = 150
x = 150
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