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x in (-oo:+oo)
Y = (8/9)*x-7 // - (8/9)*x-7
Y-((8/9)*x)+7 = 0
Y+(-8/9)*x+7 = 0
Y-8/9*x+7 = 0 // - Y+7
-8/9*x = -(Y+7) // : -8/9
x = (-(Y+7))/(-8/9)
x = 9/8*(Y+7)
x = 9/8*(Y+7)
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