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221=33-u
We move all terms to the left:
221-(33-u)=0
We add all the numbers together, and all the variables
-(-1u+33)+221=0
We get rid of parentheses
1u-33+221=0
We add all the numbers together, and all the variables
u+188=0
We move all terms containing u to the left, all other terms to the right
u=-188
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