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x in (-oo:+oo)
Y = (5/2)*x+20 // - (5/2)*x+20
Y-((5/2)*x)-20 = 0
Y+(-5/2)*x-20 = 0
Y-5/2*x-20 = 0 // - Y-20
-5/2*x = -(Y-20) // : -5/2
x = (-(Y-20))/(-5/2)
x = -2/5*(20-Y)
x = -2/5*(20-Y)
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