8+7u=3u-20

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Solution for 8+7u=3u-20 equation: 



8+7u=3u-20

We move all terms to the left:

8+7u-(3u-20)=0

We get rid of parentheses

7u-3u+20+8=0

We add all the numbers together, and all the variables

4u+28=0

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

4u=-28

u=-28/4

u=-7

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