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x in (-oo:+oo)
(1/4)*y = (1/2)*x-12 // - (1/2)*x-12
(1/4)*y-((1/2)*x)+12 = 0
(-1/2)*x+(1/4)*y+12 = 0
1/4*y-1/2*x+12 = 0 // - 1/4*y+12
-1/2*x = -(1/4*y+12) // : -1/2
x = (-(1/4*y+12))/(-1/2)
x = 2*(1/4*y+12)
x = 2*(1/4*y+12)
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