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x in (-oo:+oo)
(-8/9)*y+5/8 = x // - x
(-8/9)*y-x+5/8 = 0
5/8-x-8/9*y = 0 // - 5/8-8/9*y
-x = -(5/8-8/9*y) // * -1
x = 5/8-8/9*y
x = 5/8-8/9*y
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