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x in (-oo:+oo)
y+3 = (-1/5)*(x-6) // - (-1/5)*(x-6)
y-((-1/5)*(x-6))+3 = 0
(1/5)*(x-6)+y+3 = 0
1/5*(x-6)+y+3 = 0
1/5*(x-6)+y+3 = 0
1/5*x+y-6/5+3 = 0
1/5*x+y+9/5 = 0
1/5*x+y+9/5 = 0
1/5*x+y+9/5 = 0 // - y+9/5
1/5*x = -(y+9/5) // : 1/5
x = (-(y+9/5))/1/5
x = -5*(y+9/5)
x = -5*(y+9/5)
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