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13u+12=9u+16
We move all terms to the left:
13u+12-(9u+16)=0
We get rid of parentheses
13u-9u-16+12=0
We add all the numbers together, and all the variables
4u-4=0
We move all terms containing u to the left, all other terms to the right
4u=4
u=4/4
u=1
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