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x in (-oo:+oo)
5-((9/8)*x) = 6 // - 6
5-((9/8)*x)-6 = 0
(-9/8)*x-6+5 = 0
-9/8*x-1 = 0 // + 1
-9/8*x = 1 // : -9/8
x = 1/(-9/8)
x = -8/9
x = -8/9
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