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x in (-oo:+oo)
(-1/9)*x-8 = 4 // - 4
(-1/9)*x-8-4 = 0
-1/9*x-12 = 0 // + 12
-1/9*x = 12 // : -1/9
x = 12/(-1/9)
x = -108
x = -108
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