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x in (-oo:+oo)
y+3 = (-2/3)*(x-1) // - (-2/3)*(x-1)
y-((-2/3)*(x-1))+3 = 0
(2/3)*(x-1)+y+3 = 0
2/3*(x-1)+y+3 = 0
2/3*(x-1)+y+3 = 0
2/3*x+y-2/3+3 = 0
2/3*x+y+7/3 = 0
2/3*x+y+7/3 = 0
2/3*x+y+7/3 = 0 // - y+7/3
2/3*x = -(y+7/3) // : 2/3
x = (-(y+7/3))/2/3
x = -3/2*(y+7/3)
x = -3/2*(y+7/3)
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