5a-(12a-7)=-21

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Solution for 5a-(12a-7)=-21 equation: 



5a-(12a-7)=-21

We move all terms to the left:

5a-(12a-7)-(-21)=0

We add all the numbers together, and all the variables

5a-(12a-7)+21=0

We get rid of parentheses

5a-12a+7+21=0

We add all the numbers together, and all the variables

-7a+28=0

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

-7a=-28

a=-28/-7

a=+4

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