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x in (-oo:+oo)
-9 = 5-6*x-x // - 5-6*x-x
x-(-6*x)-9-5 = 0
6*x+x-9-5 = 0
7*x-14 = 0 // + 14
7*x = 14 // : 7
x = 14/7
x = 2
x = 2
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