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