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