13=1+-4u

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Solution for 13=1+-4u equation: 



13=1+-4u

We move all terms to the left:

13-(1+-4u)=0

We add all the numbers together, and all the variables

-(-4u)+13=0

We get rid of parentheses

4u+13=0

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

4u=-13

u=-13/4

u=-3+1/4

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