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223=-u+37
We move all terms to the left:
223-(-u+37)=0
We add all the numbers together, and all the variables
-(-1u+37)+223=0
We get rid of parentheses
1u-37+223=0
We add all the numbers together, and all the variables
u+186=0
We move all terms containing u to the left, all other terms to the right
u=-186
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