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x in (-oo:+oo)
Y-3 = (-5/7)*x // - (-5/7)*x
Y-((-5/7)*x)-3 = 0
Y+(5/7)*x-3 = 0
Y+5/7*x-3 = 0 // - Y-3
5/7*x = -(Y-3) // : 5/7
x = (-(Y-3))/5/7
x = 7/5*(3-Y)
x = 7/5*(3-Y)
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