21-8a=5(a+6)

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Solution for 21-8a=5(a+6) equation: 



21-8a=5(a+6)

We move all terms to the left:

21-8a-(5(a+6))=0



We calculate terms in parentheses: -(5(a+6)), so:

5(a+6)

We multiply parentheses

5a+30

Back to the equation:

-(5a+30)



We get rid of parentheses

-8a-5a-30+21=0

We add all the numbers together, and all the variables

-13a-9=0

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

-13a=9

a=9/-13

a=-9/13

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