840=28(u+15)

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Solution for 840=28(u+15) equation: 



840=28(u+15)

We move all terms to the left:

840-(28(u+15))=0



We calculate terms in parentheses: -(28(u+15)), so:

28(u+15)

We multiply parentheses

28u+420

Back to the equation:

-(28u+420)



We get rid of parentheses

-28u-420+840=0

We add all the numbers together, and all the variables

-28u+420=0

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

-28u=-420

u=-420/-28

u=+15

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