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x in (-oo:+oo)
(x+12)/2 = 12 // - 12
(x+12)/2-12 = 0
(x+12)/2+(-12*2)/2 = 0
x-12*2+12 = 0
x-12 = 0
(x-12)/2 = 0
(x-12)/2 = 0 // * 2
x-12 = 0
x-12 = 0 // + 12
x = 12
x = 12
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