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166=45-u
We move all terms to the left:
166-(45-u)=0
We add all the numbers together, and all the variables
-(-1u+45)+166=0
We get rid of parentheses
1u-45+166=0
We add all the numbers together, and all the variables
u+121=0
We move all terms containing u to the left, all other terms to the right
u=-121
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