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x in (-oo:+oo)
y = (2/9)*x-8 // - (2/9)*x-8
y-((2/9)*x)+8 = 0
(-2/9)*x+y+8 = 0
y-2/9*x+8 = 0 // - y+8
-2/9*x = -(y+8) // : -2/9
x = (-(y+8))/(-2/9)
x = 9/2*(y+8)
x = 9/2*(y+8)
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