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x in (-oo:+oo)
x/20 = 225/15 // - 225/15
x/20-(225/15) = 0
x/20-15 = 0
1/20*x-15 = 0 // + 15
1/20*x = 15 // : 1/20
x = 15/1/20
x = 300
x = 300
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