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x in (-oo:+oo)
y+1 = (-2/3)*(x-1) // - (-2/3)*(x-1)
y-((-2/3)*(x-1))+1 = 0
(2/3)*(x-1)+y+1 = 0
2/3*(x-1)+y+1 = 0
2/3*(x-1)+y+1 = 0
2/3*x+y-2/3+1 = 0
2/3*x+y+1/3 = 0
2/3*x+y+1/3 = 0
2/3*x+y+1/3 = 0 // - y+1/3
2/3*x = -(y+1/3) // : 2/3
x = (-(y+1/3))/2/3
x = -3/2*(y+1/3)
x = -3/2*(y+1/3)
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