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5=13-2u
We move all terms to the left:
5-(13-2u)=0
We add all the numbers together, and all the variables
-(-2u+13)+5=0
We get rid of parentheses
2u-13+5=0
We add all the numbers together, and all the variables
2u-8=0
We move all terms containing u to the left, all other terms to the right
2u=8
u=8/2
u=4
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