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