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