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