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(1/3)*x+(1/4)*x+(1/12)*x = 3 // - 3
(1/3)*x+(1/4)*x+(1/12)*x-3 = 0
2/3*x-3 = 0 // + 3
2/3*x = 3 // : 2/3
x = 3/2/3
x = 9/2
x = 9/2
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