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x in (-oo:+oo)
y+3 = (-2/3)*(x+6) // - (-2/3)*(x+6)
y-((-2/3)*(x+6))+3 = 0
(2/3)*(x+6)+y+3 = 0
2/3*(x+6)+y+3 = 0
2/3*(x+6)+y+3 = 0
2/3*x+y+3+4 = 0
2/3*x+y+7 = 0
2/3*x+y+7 = 0
2/3*x+y+7 = 0 // - y+7
2/3*x = -(y+7) // : 2/3
x = (-(y+7))/2/3
x = -3/2*(y+7)
x = -3/2*(y+7)
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