3(a-6)=-21.

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Solution for 3(a-6)=-21. equation: 



3(a-6)=-21.

We move all terms to the left:

3(a-6)-(-21.)=0

We add all the numbers together, and all the variables

3(a-6)-(-21)=0

We add all the numbers together, and all the variables

3(a-6)+21=0

We multiply parentheses

3a-18+21=0

We add all the numbers together, and all the variables

3a+3=0

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

3a=-3

a=-3/3

a=-1

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