-21=-7(a-2)

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Solution for -21=-7(a-2) equation: 



-21=-7(a-2)

We move all terms to the left:

-21-(-7(a-2))=0



We calculate terms in parentheses: -(-7(a-2)), so:

-7(a-2)

We multiply parentheses

-7a+14

Back to the equation:

-(-7a+14)



We get rid of parentheses

7a-14-21=0

We add all the numbers together, and all the variables

7a-35=0

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

7a=35

a=35/7

a=5

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