3(a+7)=21-3a

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Solution for 3(a+7)=21-3a equation: 



3(a+7)=21-3a

We move all terms to the left:

3(a+7)-(21-3a)=0

We add all the numbers together, and all the variables

3(a+7)-(-3a+21)=0

We multiply parentheses

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

We get rid of parentheses

3a+3a-21+21=0

We add all the numbers together, and all the variables

6a=0

a=0/6

a=0

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