9+3=12+u-8/2

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Solution for 9+3=12+u-8/2 equation: 



9+3=12+u-8/2

We move all terms to the left:

9+3-(12+u-8/2)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(u+8)+12=0

We get rid of parentheses

-u-8+12=0

We add all the numbers together, and all the variables

-1u+4=0

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

-u=-4

u=-4/-1

u=+4

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