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x in (-oo:+oo)
(1*x)/2 = 6 // - 6
(1*x)/2-6 = 0
x/2-6 = 0
1/2*x-6 = 0 // + 6
1/2*x = 6 // : 1/2
x = 6/1/2
x = 12
x = 12
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