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