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(1/2)*x+(1/3)*x = 1/3+3 // - 1/3+3
(1/2)*x+(1/3)*x-(1/3)-3 = 0
(1/2)*x+(1/3)*x-1/3-3 = 0
5/6*x-10/3 = 0 // + 10/3
5/6*x = 10/3 // : 5/6
x = 10/3/5/6
x = 4
x = 4
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