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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*(Y+20)
x = 2/5*(Y+20)
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