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x in (-oo:+oo)
4*(1/4)*y = (1/4)*x+8*(1/4) // - (1/4)*x+8*(1/4)
4*(1/4)*y-((1/4)*x)-(8*(1/4)) = 0
(-1/4)*x+4*(1/4)*y-2 = 0
y-1/4*x-2 = 0 // - y-2
-1/4*x = -(y-2) // : -1/4
x = (-(y-2))/(-1/4)
x = -4*(2-y)
x = -4*(2-y)
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