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x in (-oo:+oo)
-16 = (8*x)/9 // - (8*x)/9
-((8*x)/9)-16 = 0
(-8/9)*x-16 = 0
-8/9*x-16 = 0 // + 16
-8/9*x = 16 // : -8/9
x = 16/(-8/9)
x = -18
x = -18
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