5u+21=3u-5

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Solution for 5u+21=3u-5 equation: 



5u+21=3u-5

We move all terms to the left:

5u+21-(3u-5)=0

We get rid of parentheses

5u-3u+5+21=0

We add all the numbers together, and all the variables

2u+26=0

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

2u=-26

u=-26/2

u=-13

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