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x in (-oo:+oo)
y+4 = (-1/3)*(x-6) // - (-1/3)*(x-6)
y-((-1/3)*(x-6))+4 = 0
(1/3)*(x-6)+y+4 = 0
1/3*(x-6)+y+4 = 0
1/3*(x-6)+y+4 = 0
1/3*x+y-2+4 = 0
1/3*x+y+2 = 0
1/3*x+y+2 = 0
1/3*x+y+2 = 0 // - y+2
1/3*x = -(y+2) // : 1/3
x = (-(y+2))/1/3
x = -3*(y+2)
x = -3*(y+2)
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