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x in (-oo:+oo)
y = (-3/7)*x-(4/7) // - (-3/7)*x-(4/7)
y-((-3/7)*x)+4/7 = 0
(3/7)*x+y+4/7 = 0
3/7*x+y+4/7 = 0 // - y+4/7
3/7*x = -(y+4/7) // : 3/7
x = (-(y+4/7))/3/7
x = -7/3*(y+4/7)
x = -7/3*(y+4/7)
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