3a-21=-2(a+7)

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Solution for 3a-21=-2(a+7) equation: 



3a-21=-2(a+7)

We move all terms to the left:

3a-21-(-2(a+7))=0



We calculate terms in parentheses: -(-2(a+7)), so:

-2(a+7)

We multiply parentheses

-2a-14

Back to the equation:

-(-2a-14)



We get rid of parentheses

3a+2a+14-21=0

We add all the numbers together, and all the variables

5a-7=0

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

5a=7

a=7/5

a=1+2/5

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