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x in (-oo:+oo)
(1/2)*x-6*x-9 = -10 // + 10
(1/2)*x-6*x-9+10 = 0
1-11/2*x = 0 // - 1
-11/2*x = -1 // : -11/2
x = -1/(-11/2)
x = 2/11
x = 2/11
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