3a-3(7+5a)=-9(-2+a)

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Solution for 3a-3(7+5a)=-9(-2+a) equation: 



3a-3(7+5a)=-9(-2+a)

We move all terms to the left:

3a-3(7+5a)-(-9(-2+a))=0

We add all the numbers together, and all the variables

3a-3(5a+7)-(-9(a-2))=0

We multiply parentheses

3a-15a-(-9(a-2))-21=0



We calculate terms in parentheses: -(-9(a-2)), so:

-9(a-2)

We multiply parentheses

-9a+18

Back to the equation:

-(-9a+18)



We add all the numbers together, and all the variables

-12a-(-9a+18)-21=0

We get rid of parentheses

-12a+9a-18-21=0

We add all the numbers together, and all the variables

-3a-39=0

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

-3a=39

a=39/-3

a=-13

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