4u+21=8u-11

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Solution for 4u+21=8u-11 equation: 



4u+21=8u-11

We move all terms to the left:

4u+21-(8u-11)=0

We get rid of parentheses

4u-8u+11+21=0

We add all the numbers together, and all the variables

-4u+32=0

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

-4u=-32

u=-32/-4

u=+8

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