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x in (-oo:+oo)
(9-x)/2 = 13 // - 13
(9-x)/2-13 = 0
(9-x)/2+(-13*2)/2 = 0
9-x-13*2 = 0
-x-17 = 0
(-x-17)/2 = 0
(-x-17)/2 = 0 // * 2
-x-17 = 0
-x-17 = 0 // + 17
-x = 17 // * -1
x = -17
x = -17
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