13=25-4u

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Solution for 13=25-4u equation: 



13=25-4u

We move all terms to the left:

13-(25-4u)=0

We add all the numbers together, and all the variables

-(-4u+25)+13=0

We get rid of parentheses

4u-25+13=0

We add all the numbers together, and all the variables

4u-12=0

We move all terms containing u to the left, all other terms to the right

4u=12

u=12/4

u=3

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