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Y+6 = (-7/8)*(x-8) // - (-7/8)*(x-8)
Y-((-7/8)*(x-8))+6 = 0
(7/8)*(x-8)+Y+6 = 0
7/8*(x-8)+Y+6 = 0
7/8*(x-8)+Y+6 = 0
Y+7/8*x-7+6 = 0
Y+7/8*x-1 = 0
Y+7/8*x-1 = 0
Y+7/8*x-1 = 0 // - Y-1
7/8*x = -(Y-1) // : 7/8
x = (-(Y-1))/7/8
x = 8/7*(1-Y)
x = 8/7*(1-Y)
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