21+7a=5(3a+4)

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Solution for 21+7a=5(3a+4) equation: 



21+7a=5(3a+4)

We move all terms to the left:

21+7a-(5(3a+4))=0



We calculate terms in parentheses: -(5(3a+4)), so:

5(3a+4)

We multiply parentheses

15a+20

Back to the equation:

-(15a+20)



We get rid of parentheses

7a-15a-20+21=0

We add all the numbers together, and all the variables

-8a+1=0

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

-8a=-1

a=-1/-8

a=1/8

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