5a+(-12-9a)=-3(7a+3)

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Solution for 5a+(-12-9a)=-3(7a+3) equation: 



5a+(-12-9a)=-3(7a+3)

We move all terms to the left:

5a+(-12-9a)-(-3(7a+3))=0

We add all the numbers together, and all the variables

5a+(-9a-12)-(-3(7a+3))=0

We get rid of parentheses

5a-9a-(-3(7a+3))-12=0



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

-3(7a+3)

We multiply parentheses

-21a-9

Back to the equation:

-(-21a-9)



We add all the numbers together, and all the variables

-4a-(-21a-9)-12=0

We get rid of parentheses

-4a+21a+9-12=0

We add all the numbers together, and all the variables

17a-3=0

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

17a=3

a=3/17

a=3/17

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