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x in (-oo:+oo)
y-1 = (-2/3)*(x+2) // - (-2/3)*(x+2)
y-((-2/3)*(x+2))-1 = 0
(2/3)*(x+2)+y-1 = 0
2/3*(x+2)+y-1 = 0
2/3*(x+2)+y-1 = 0
2/3*x+y-1+4/3 = 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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