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x in (-oo:+oo)
Y-5 = (-2/7)*x // - (-2/7)*x
Y-((-2/7)*x)-5 = 0
Y+(2/7)*x-5 = 0
Y+2/7*x-5 = 0 // - Y-5
2/7*x = -(Y-5) // : 2/7
x = (-(Y-5))/2/7
x = 7/2*(5-Y)
x = 7/2*(5-Y)
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