u+2u=-6

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Solution for u+2u=-6 equation: 



u+2u=-6

We move all terms to the left:

u+2u-(-6)=0

We add all the numbers together, and all the variables

3u+6=0

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

3u=-6

u=-6/3

u=-2

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