7u+3=3u-9

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



7u+3=3u-9

We move all terms to the left:

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

We get rid of parentheses

7u-3u+9+3=0

We add all the numbers together, and all the variables

4u+12=0

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

4u=-12

u=-12/4

u=-3

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