21(a+1)=3(3a+7)

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Solution for 21(a+1)=3(3a+7) equation: 



21(a+1)=3(3a+7)

We move all terms to the left:

21(a+1)-(3(3a+7))=0

We multiply parentheses

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



We calculate terms in parentheses: -(3(3a+7)), so:

3(3a+7)

We multiply parentheses

9a+21

Back to the equation:

-(9a+21)



We get rid of parentheses

21a-9a-21+21=0

We add all the numbers together, and all the variables

12a=0

a=0/12

a=0

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