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9u-13=4u+12
We move all terms to the left:
9u-13-(4u+12)=0
We get rid of parentheses
9u-4u-12-13=0
We add all the numbers together, and all the variables
5u-25=0
We move all terms containing u to the left, all other terms to the right
5u=25
u=25/5
u=5
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