180=90+u

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Solution for 180=90+u equation: 



180=90+u

We move all terms to the left:

180-(90+u)=0

We add all the numbers together, and all the variables

-(u+90)+180=0

We get rid of parentheses

-u-90+180=0

We add all the numbers together, and all the variables

-1u+90=0

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

-u=-90

u=-90/-1

u=+90

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