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u+35=12u-31
We move all terms to the left:
u+35-(12u-31)=0
We get rid of parentheses
u-12u+31+35=0
We add all the numbers together, and all the variables
-11u+66=0
We move all terms containing u to the left, all other terms to the right
-11u=-66
u=-66/-11
u=+6
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