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-13=3u+10
We move all terms to the left:
-13-(3u+10)=0
We get rid of parentheses
-3u-10-13=0
We add all the numbers together, and all the variables
-3u-23=0
We move all terms containing u to the left, all other terms to the right
-3u=23
u=23/-3
u=-7+2/3
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