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x in (-oo:+oo)
-8*y = (2/5)*x+20 // - (2/5)*x+20
-((2/5)*x)-8*y-20 = 0
(-2/5)*x-8*y-20 = 0
-2/5*x-8*y-20 = 0 // + -8*y-20
-2/5*x = -(-8*y-20) // : -2/5
x = (-(-8*y-20))/(-2/5)
x = -5/2*(20-(-8*y))
x = -5/2*(20-(-8*y))
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