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x in (-oo:+oo)
y = 25-((5*x)/3) // - 25-((5*x)/3)
(5*x)/3+y-25 = 0
5/3*x+y-25 = 0 // - y-25
5/3*x = -(y-25) // : 5/3
x = (-(y-25))/5/3
x = 3/5*(25-y)
x = 3/5*(25-y)
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