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x in (-oo:+oo)
(9-x)/2 = 11 // - 11
(9-x)/2-11 = 0
(9-x)/2+(-11*2)/2 = 0
9-x-11*2 = 0
-x-13 = 0
(-x-13)/2 = 0
(-x-13)/2 = 0 // * 2
-x-13 = 0
-x-13 = 0 // + 13
-x = 13 // * -1
x = -13
x = -13
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