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x in (-oo:+oo)
Y = (8/9)*x-6 // - (8/9)*x-6
Y-((8/9)*x)+6 = 0
Y+(-8/9)*x+6 = 0
Y-8/9*x+6 = 0 // - Y+6
-8/9*x = -(Y+6) // : -8/9
x = (-(Y+6))/(-8/9)
x = 9/8*(Y+6)
x = 9/8*(Y+6)
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