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x in (-oo:+oo)
y+5 = (-1/2)*(x+1) // - (-1/2)*(x+1)
y-((-1/2)*(x+1))+5 = 0
(1/2)*(x+1)+y+5 = 0
1/2*(x+1)+y+5 = 0
1/2*(x+1)+y+5 = 0
1/2*x+y+1/2+5 = 0
1/2*x+y+11/2 = 0
1/2*x+y+11/2 = 0
1/2*x+y+11/2 = 0 // - y+11/2
1/2*x = -(y+11/2) // : 1/2
x = (-(y+11/2))/1/2
x = -2*(y+11/2)
x = -2*(y+11/2)
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