55=43+u

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Solution for 55=43+u equation: 



55=43+u

We move all terms to the left:

55-(43+u)=0

We add all the numbers together, and all the variables

-(u+43)+55=0

We get rid of parentheses

-u-43+55=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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