3=-7+u

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Solution for 3=-7+u equation: 



3=-7+u

We move all terms to the left:

3-(-7+u)=0

We add all the numbers together, and all the variables

-(u-7)+3=0

We get rid of parentheses

-u+7+3=0

We add all the numbers together, and all the variables

-1u+10=0

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

-u=-10

u=-10/-1

u=+10

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