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x in (-oo:+oo)
(x-6)/2 = 6 // - 6
(x-6)/2-6 = 0
(x-6)/2+(-6*2)/2 = 0
x-6*2-6 = 0
x-18 = 0
(x-18)/2 = 0
(x-18)/2 = 0 // * 2
x-18 = 0
x-18 = 0 // + 18
x = 18
x = 18
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