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-13=9u+5
We move all terms to the left:
-13-(9u+5)=0
We get rid of parentheses
-9u-5-13=0
We add all the numbers together, and all the variables
-9u-18=0
We move all terms containing u to the left, all other terms to the right
-9u=18
u=18/-9
u=-2
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