u+2u=3

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Solution for u+2u=3 equation: 



u+2u=3

We move all terms to the left:

u+2u-(3)=0

We add all the numbers together, and all the variables

3u-3=0

We move all terms containing u to the left, all other terms to the right

3u=3

u=3/3

u=1

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