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x in (-oo:+oo)
y+6 = (-5/7)*(x-4) // - (-5/7)*(x-4)
y-((-5/7)*(x-4))+6 = 0
(5/7)*(x-4)+y+6 = 0
5/7*(x-4)+y+6 = 0
5/7*(x-4)+y+6 = 0
5/7*x+y-20/7+6 = 0
5/7*x+y+22/7 = 0
5/7*x+y+22/7 = 0
5/7*x+y+22/7 = 0 // - y+22/7
5/7*x = -(y+22/7) // : 5/7
x = (-(y+22/7))/5/7
x = -7/5*(y+22/7)
x = -7/5*(y+22/7)
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