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x in (-oo:+oo)
x+x/5+y = 250 // - 250
x+x/5+y-250 = 0
6/5*x+y-250 = 0 // - y-250
6/5*x = -(y-250) // : 6/5
x = (-(y-250))/6/5
x = 5/6*(250-y)
x = 5/6*(250-y)
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