12+u+7=-2-2u

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Solution for 12+u+7=-2-2u equation: 



12+u+7=-2-2u

We move all terms to the left:

12+u+7-(-2-2u)=0

We add all the numbers together, and all the variables

u-(-2u-2)+12+7=0

We add all the numbers together, and all the variables

u-(-2u-2)+19=0

We get rid of parentheses

u+2u+2+19=0

We add all the numbers together, and all the variables

3u+21=0

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

3u=-21

u=-21/3

u=-7

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