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207=28-u
We move all terms to the left:
207-(28-u)=0
We add all the numbers together, and all the variables
-(-1u+28)+207=0
We get rid of parentheses
1u-28+207=0
We add all the numbers together, and all the variables
u+179=0
We move all terms containing u to the left, all other terms to the right
u=-179
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