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x in (-oo:+oo)
-((1/9)*x)-6 = -18 // + 18
18-((1/9)*x)-6 = 0
(-1/9)*x-6+18 = 0
12-1/9*x = 0 // - 12
-1/9*x = -12 // : -1/9
x = -12/(-1/9)
x = 108
x = 108
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