3+a=-3(a+7)

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Solution for 3+a=-3(a+7) equation: 



3+a=-3(a+7)

We move all terms to the left:

3+a-(-3(a+7))=0



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

-3(a+7)

We multiply parentheses

-3a-21

Back to the equation:

-(-3a-21)



We get rid of parentheses

a+3a+21+3=0

We add all the numbers together, and all the variables

4a+24=0

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

4a=-24

a=-24/4

a=-6

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