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x in (-oo:+oo)
y = (1/4)*x-20 // - (1/4)*x-20
y-((1/4)*x)+20 = 0
(-1/4)*x+y+20 = 0
y-1/4*x+20 = 0 // - y+20
-1/4*x = -(y+20) // : -1/4
x = (-(y+20))/(-1/4)
x = 4*(y+20)
x = 4*(y+20)
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