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183=31-u
We move all terms to the left:
183-(31-u)=0
We add all the numbers together, and all the variables
-(-1u+31)+183=0
We get rid of parentheses
1u-31+183=0
We add all the numbers together, and all the variables
u+152=0
We move all terms containing u to the left, all other terms to the right
u=-152
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