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(12-x)/2 = 5 // - 5
(12-x)/2-5 = 0
(12-x)/2+(-5*2)/2 = 0
12-x-5*2 = 0
2-x = 0
(2-x)/2 = 0
(2-x)/2 = 0 // * 2
2-x = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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