3(a+7)=-3(2a-1)

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Solution for 3(a+7)=-3(2a-1) equation: 



3(a+7)=-3(2a-1)

We move all terms to the left:

3(a+7)-(-3(2a-1))=0

We multiply parentheses

3a-(-3(2a-1))+21=0



We calculate terms in parentheses: -(-3(2a-1)), so:

-3(2a-1)

We multiply parentheses

-6a+3

Back to the equation:

-(-6a+3)



We get rid of parentheses

3a+6a-3+21=0

We add all the numbers together, and all the variables

9a+18=0

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

9a=-18

a=-18/9

a=-2

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