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232=145-u
We move all terms to the left:
232-(145-u)=0
We add all the numbers together, and all the variables
-(-1u+145)+232=0
We get rid of parentheses
1u-145+232=0
We add all the numbers together, and all the variables
u+87=0
We move all terms containing u to the left, all other terms to the right
u=-87
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