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x in (-oo:+oo)
y-3 = (-6/7)*x // - (-6/7)*x
y-((-6/7)*x)-3 = 0
(6/7)*x+y-3 = 0
6/7*x+y-3 = 0 // - y-3
6/7*x = -(y-3) // : 6/7
x = (-(y-3))/6/7
x = 7/6*(3-y)
x = 7/6*(3-y)
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