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-13=-2u-25
We move all terms to the left:
-13-(-2u-25)=0
We get rid of parentheses
2u+25-13=0
We add all the numbers together, and all the variables
2u+12=0
We move all terms containing u to the left, all other terms to the right
2u=-12
u=-12/2
u=-6
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