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x in (-oo:+oo)
y+6 = (-1/10)*(x+12) // - (-1/10)*(x+12)
y-((-1/10)*(x+12))+6 = 0
(1/10)*(x+12)+y+6 = 0
1/10*(x+12)+y+6 = 0
1/10*(x+12)+y+6 = 0
1/10*x+y+6/5+6 = 0
1/10*x+y+36/5 = 0
1/10*x+y+36/5 = 0
1/10*x+y+36/5 = 0 // - y+36/5
1/10*x = -(y+36/5) // : 1/10
x = (-(y+36/5))/1/10
x = -10*(y+36/5)
x = -10*(y+36/5)
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