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x in (-oo:+oo)
(2/3)*x+(1/4)*x+1 = 12 // - 12
(2/3)*x+(1/4)*x-12+1 = 0
11/12*x-11 = 0 // + 11
11/12*x = 11 // : 11/12
x = 11/11/12
x = 12
x = 12
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