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x in (-oo:+oo)
x/250 = 18/100 // - 18/100
x/250-(18/100) = 0
x/250-9/50 = 0
1/250*x-9/50 = 0 // + 9/50
1/250*x = 9/50 // : 1/250
x = 9/50/1/250
x = 45
x = 45
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