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31=196-u
We move all terms to the left:
31-(196-u)=0
We add all the numbers together, and all the variables
-(-1u+196)+31=0
We get rid of parentheses
1u-196+31=0
We add all the numbers together, and all the variables
u-165=0
We move all terms containing u to the left, all other terms to the right
u=165
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