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x in (-oo:+oo)
y-20 = (-3/4)*x // - (-3/4)*x
y-((-3/4)*x)-20 = 0
(3/4)*x+y-20 = 0
3/4*x+y-20 = 0 // - y-20
3/4*x = -(y-20) // : 3/4
x = (-(y-20))/3/4
x = 4/3*(20-y)
x = 4/3*(20-y)
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