12u=21+5u

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Solution for 12u=21+5u equation: 



12u=21+5u

We move all terms to the left:

12u-(21+5u)=0

We add all the numbers together, and all the variables

12u-(5u+21)=0

We get rid of parentheses

12u-5u-21=0

We add all the numbers together, and all the variables

7u-21=0

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

7u=21

u=21/7

u=3

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