20=5+u

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Solution for 20=5+u equation: 



20=5+u

We move all terms to the left:

20-(5+u)=0

We add all the numbers together, and all the variables

-(u+5)+20=0

We get rid of parentheses

-u-5+20=0

We add all the numbers together, and all the variables

-1u+15=0

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

-u=-15

u=-15/-1

u=+15

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