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x in (-oo:+oo)
-(2*x)-9 = -25 // + 25
25-(2*x)-9 = 0
25-2*x-9 = 0
16-2*x = 0 // - 16
-2*x = -16 // : -2
x = -16/(-2)
x = 8
x = 8
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