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236=40-u

We move all terms to the left:

236-(40-u)=0

We add all the numbers together, and all the variables

-(-1u+40)+236=0

We get rid of parentheses

1u-40+236=0

We add all the numbers together, and all the variables

u+196=0

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

u=-196

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