3u+7(u-7)=31

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Solution for 3u+7(u-7)=31 equation: 



3u+7(u-7)=31

We move all terms to the left:

3u+7(u-7)-(31)=0

We multiply parentheses

3u+7u-49-31=0

We add all the numbers together, and all the variables

10u-80=0

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

10u=80

u=80/10

u=8

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