-28=3(7a+4)

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



-28=3(7a+4)

We move all terms to the left:

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



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

3(7a+4)

We multiply parentheses

21a+12

Back to the equation:

-(21a+12)



We get rid of parentheses

-21a-12-28=0

We add all the numbers together, and all the variables

-21a-40=0

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

-21a=40

a=40/-21

a=-1+19/21

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