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