-28=7(-3a-4)

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Solution for -28=7(-3a-4) equation: 



-28=7(-3a-4)

We move all terms to the left:

-28-(7(-3a-4))=0



We calculate terms in parentheses: -(7(-3a-4)), so:

7(-3a-4)

We multiply parentheses

-21a-28

Back to the equation:

-(-21a-28)



We get rid of parentheses

21a+28-28=0

We add all the numbers together, and all the variables

21a=0

a=0/21

a=0

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