7(6+a)=-21

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Solution for 7(6+a)=-21 equation: 



7(6+a)=-21

We move all terms to the left:

7(6+a)-(-21)=0

We add all the numbers together, and all the variables

7(a+6)-(-21)=0

We add all the numbers together, and all the variables

7(a+6)+21=0

We multiply parentheses

7a+42+21=0

We add all the numbers together, and all the variables

7a+63=0

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

7a=-63

a=-63/7

a=-9

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