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x in (-oo:+oo)
(1/3)*x+(1/4)*x = 1 // - 1
(1/3)*x+(1/4)*x-1 = 0
7/12*x-1 = 0 // + 1
7/12*x = 1 // : 7/12
x = 1/7/12
x = 12/7
x = 12/7
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