20=u+15

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Solution for 20=u+15 equation: 



20=u+15

We move all terms to the left:

20-(u+15)=0

We get rid of parentheses

-u-15+20=0

We add all the numbers together, and all the variables

-1u+5=0

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

-u=-5

u=-5/-1

u=+5

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