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x in (-oo:+oo)
y = (8/9)*x+5 // - (8/9)*x+5
y-((8/9)*x)-5 = 0
(-8/9)*x+y-5 = 0
y-8/9*x-5 = 0 // - y-5
-8/9*x = -(y-5) // : -8/9
x = (-(y-5))/(-8/9)
x = -9/8*(5-y)
x = -9/8*(5-y)
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