-7u+2(u-2)=21

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Solution for -7u+2(u-2)=21 equation: 



-7u+2(u-2)=21

We move all terms to the left:

-7u+2(u-2)-(21)=0

We multiply parentheses

-7u+2u-4-21=0

We add all the numbers together, and all the variables

-5u-25=0

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

-5u=25

u=25/-5

u=-5

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