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x in (-oo:+oo)
y = (2/5)*x+25 // - (2/5)*x+25
y-((2/5)*x)-25 = 0
(-2/5)*x+y-25 = 0
y-2/5*x-25 = 0 // - y-25
-2/5*x = -(y-25) // : -2/5
x = (-(y-25))/(-2/5)
x = -5/2*(25-y)
x = -5/2*(25-y)
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