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x in (-oo:+oo)
(2*x)/6+x+12 = 5 // - 5
(2*x)/6+x-5+12 = 0
4/3*x+7 = 0 // - 7
4/3*x = -7 // : 4/3
x = -7/4/3
x = -21/4
x = -21/4
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