3u+20=-7u

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Solution for 3u+20=-7u equation: 



3u+20=-7u

We move all terms to the left:

3u+20-(-7u)=0

We get rid of parentheses

3u+7u+20=0

We add all the numbers together, and all the variables

10u+20=0

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

10u=-20

u=-20/10

u=-2

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