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290=235-u
We move all terms to the left:
290-(235-u)=0
We add all the numbers together, and all the variables
-(-1u+235)+290=0
We get rid of parentheses
1u-235+290=0
We add all the numbers together, and all the variables
u+55=0
We move all terms containing u to the left, all other terms to the right
u=-55
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