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