21-6a=-7(2a+5)

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Solution for 21-6a=-7(2a+5) equation: 



21-6a=-7(2a+5)

We move all terms to the left:

21-6a-(-7(2a+5))=0



We calculate terms in parentheses: -(-7(2a+5)), so:

-7(2a+5)

We multiply parentheses

-14a-35

Back to the equation:

-(-14a-35)



We get rid of parentheses

-6a+14a+35+21=0

We add all the numbers together, and all the variables

8a+56=0

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

8a=-56

a=-56/8

a=-7

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