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33=13-10u
We move all terms to the left:
33-(13-10u)=0
We add all the numbers together, and all the variables
-(-10u+13)+33=0
We get rid of parentheses
10u-13+33=0
We add all the numbers together, and all the variables
10u+20=0
We move all terms containing u to the left, all other terms to the right
10u=-20
u=-20/10
u=-2
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