7u+3=8u-9

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Solution for 7u+3=8u-9 equation: 



7u+3=8u-9

We move all terms to the left:

7u+3-(8u-9)=0

We get rid of parentheses

7u-8u+9+3=0

We add all the numbers together, and all the variables

-1u+12=0

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

-u=-12

u=-12/-1

u=+12

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