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x in (-oo:+oo)
Y = (7/8)*x-1 // - (7/8)*x-1
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*(Y+1)
x = 8/7*(Y+1)
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