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166=28-u
We move all terms to the left:
166-(28-u)=0
We add all the numbers together, and all the variables
-(-1u+28)+166=0
We get rid of parentheses
1u-28+166=0
We add all the numbers together, and all the variables
u+138=0
We move all terms containing u to the left, all other terms to the right
u=-138
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