3+6u=-6u-9

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Solution for 3+6u=-6u-9 equation: 



3+6u=-6u-9

We move all terms to the left:

3+6u-(-6u-9)=0

We get rid of parentheses

6u+6u+9+3=0

We add all the numbers together, and all the variables

12u+12=0

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

12u=-12

u=-12/12

u=-1

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