3u+15=-3(u-7)

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Solution for 3u+15=-3(u-7) equation: 



3u+15=-3(u-7)

We move all terms to the left:

3u+15-(-3(u-7))=0



We calculate terms in parentheses: -(-3(u-7)), so:

-3(u-7)

We multiply parentheses

-3u+21

Back to the equation:

-(-3u+21)



We get rid of parentheses

3u+3u-21+15=0

We add all the numbers together, and all the variables

6u-6=0

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

6u=6

u=6/6

u=1

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