-3=-3(-7+a)

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



-3=-3(-7+a)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-3(a-7)), so:

-3(a-7)

We multiply parentheses

-3a+21

Back to the equation:

-(-3a+21)



We get rid of parentheses

3a-21-3=0

We add all the numbers together, and all the variables

3a-24=0

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

3a=24

a=24/3

a=8

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