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