8u+21=4u-27

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Solution for 8u+21=4u-27 equation: 



8u+21=4u-27

We move all terms to the left:

8u+21-(4u-27)=0

We get rid of parentheses

8u-4u+27+21=0

We add all the numbers together, and all the variables

4u+48=0

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

4u=-48

u=-48/4

u=-12

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