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x in (-oo:+oo)
x/250 = 15/100 // - 15/100
x/250-(15/100) = 0
x/250-3/20 = 0
1/250*x-3/20 = 0 // + 3/20
1/250*x = 3/20 // : 1/250
x = 3/20/1/250
x = 75/2
x = 75/2
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