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So your equation is 3/x + 1/2 = 1/3 right? First, you have to subtract 1/2 from both sides. 1/3 and 1/2 have to have the same denominator to be added or subtracted, so 1/3 becomes 2/6 and 1/2 becomes 3/6. 2/6 - 3/6 = -1/6 .
Now you have 3/x = -1/6. Cross multiply and you get 18 = -x. Therefore, x = -18.
Hope that helps
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