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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

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

We get rid of parentheses

-7a+7a-21+21=0

We add all the numbers together, and all the variables

=0

a=0/1

a=0

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