243=131-u

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Solution for 243=131-u equation: 



243=131-u

We move all terms to the left:

243-(131-u)=0

We add all the numbers together, and all the variables

-(-1u+131)+243=0

We get rid of parentheses

1u-131+243=0

We add all the numbers together, and all the variables

u+112=0

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

u=-112

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