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673=29u+64
We move all terms to the left:
673-(29u+64)=0
We get rid of parentheses
-29u-64+673=0
We add all the numbers together, and all the variables
-29u+609=0
We move all terms containing u to the left, all other terms to the right
-29u=-609
u=-609/-29
u=+21
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