3u=-40-7u

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Solution for 3u=-40-7u equation: 



3u=-40-7u

We move all terms to the left:

3u-(-40-7u)=0

We add all the numbers together, and all the variables

3u-(-7u-40)=0

We get rid of parentheses

3u+7u+40=0

We add all the numbers together, and all the variables

10u+40=0

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

10u=-40

u=-40/10

u=-4

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