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