51=243-u

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Solution for 51=243-u equation: 



51=243-u

We move all terms to the left:

51-(243-u)=0

We add all the numbers together, and all the variables

-(-1u+243)+51=0

We get rid of parentheses

1u-243+51=0

We add all the numbers together, and all the variables

u-192=0

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

u=192

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