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214=142-u
We move all terms to the left:
214-(142-u)=0
We add all the numbers together, and all the variables
-(-1u+142)+214=0
We get rid of parentheses
1u-142+214=0
We add all the numbers together, and all the variables
u+72=0
We move all terms containing u to the left, all other terms to the right
u=-72
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