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x in (-oo:+oo)
Y-5 = (-7/8)*x-(21/8) // - (-7/8)*x-(21/8)
Y-((-7/8)*x)+21/8-5 = 0
Y+(7/8)*x+21/8-5 = 0
Y+7/8*x-19/8 = 0 // - Y-19/8
7/8*x = -(Y-19/8) // : 7/8
x = (-(Y-19/8))/7/8
x = 8/7*(19/8-Y)
x = 8/7*(19/8-Y)
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