280=0.5*(u+20)*20

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Solution for 280=0.5*(u+20)*20 equation: 



280=0.5(u+20)*20

We move all terms to the left:

280-(0.5(u+20)*20)=0



We calculate terms in parentheses: -(0.5(u+20)*20), so:

0.5(u+20)*20

We multiply parentheses

10u+200

Back to the equation:

-(10u+200)



We get rid of parentheses

-10u-200+280=0

We add all the numbers together, and all the variables

-10u+80=0

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

-10u=-80

u=-80/-10

u=+8

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