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a in (-oo:+oo)
(2*(a+4))/2 = 12/2 // - 12/2
(2*(a+4))/2-(12/2) = 0
(2*(a+4))/2-6 = 0
a-6+4 = 0
a-6+4 = 0
a-2 = 0
a-2 = 0
a-2 = 0 // + 2
a = 2
a = 2
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