-7u+3(u-5)=21

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Solution for -7u+3(u-5)=21 equation: 



-7u+3(u-5)=21

We move all terms to the left:

-7u+3(u-5)-(21)=0

We multiply parentheses

-7u+3u-15-21=0

We add all the numbers together, and all the variables

-4u-36=0

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

-4u=36

u=36/-4

u=-9

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