21=-7(a-4)

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Solution for 21=-7(a-4) equation: 



21=-7(a-4)

We move all terms to the left:

21-(-7(a-4))=0



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

-7(a-4)

We multiply parentheses

-7a+28

Back to the equation:

-(-7a+28)



We get rid of parentheses

7a-28+21=0

We add all the numbers together, and all the variables

7a-7=0

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

7a=7

a=7/7

a=1

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