3(u-7)=9u+3

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Solution for 3(u-7)=9u+3 equation: 



3(u-7)=9u+3

We move all terms to the left:

3(u-7)-(9u+3)=0

We multiply parentheses

3u-(9u+3)-21=0

We get rid of parentheses

3u-9u-3-21=0

We add all the numbers together, and all the variables

-6u-24=0

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

-6u=24

u=24/-6

u=-4

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