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213=45-u
We move all terms to the left:
213-(45-u)=0
We add all the numbers together, and all the variables
-(-1u+45)+213=0
We get rid of parentheses
1u-45+213=0
We add all the numbers together, and all the variables
u+168=0
We move all terms containing u to the left, all other terms to the right
u=-168
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