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x in (-oo:+oo)
(1/2)*x = 5+7 // - 5+7
(1/2)*x-7-5 = 0
1/2*x-12 = 0 // + 12
1/2*x = 12 // : 1/2
x = 12/1/2
x = 24
x = 24
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