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