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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-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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