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x in (-oo:+oo)
y = (9/8)*x-6 // - (9/8)*x-6
y-((9/8)*x)+6 = 0
(-9/8)*x+y+6 = 0
y-9/8*x+6 = 0 // - y+6
-9/8*x = -(y+6) // : -9/8
x = (-(y+6))/(-9/8)
x = 8/9*(y+6)
x = 8/9*(y+6)
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