-7(a+3)=7(1+3a)

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Solution for -7(a+3)=7(1+3a) equation: 



-7(a+3)=7(1+3a)

We move all terms to the left:

-7(a+3)-(7(1+3a))=0

We add all the numbers together, and all the variables

-7(a+3)-(7(3a+1))=0

We multiply parentheses

-7a-(7(3a+1))-21=0



We calculate terms in parentheses: -(7(3a+1)), so:

7(3a+1)

We multiply parentheses

21a+7

Back to the equation:

-(21a+7)



We get rid of parentheses

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

We add all the numbers together, and all the variables

-28a-28=0

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

-28a=28

a=28/-28

a=-1

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