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x in (-oo:+oo)
(1/2)*x+12 = 5/6 // - 5/6
(1/2)*x-(5/6)+12 = 0
(1/2)*x-5/6+12 = 0
1/2*x+67/6 = 0 // - 67/6
1/2*x = -67/6 // : 1/2
x = -67/6/1/2
x = -67/3
x = -67/3
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