2(3a+21)=3(a+4)

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Solution for 2(3a+21)=3(a+4) equation: 



2(3a+21)=3(a+4)

We move all terms to the left:

2(3a+21)-(3(a+4))=0

We multiply parentheses

6a-(3(a+4))+42=0



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

3(a+4)

We multiply parentheses

3a+12

Back to the equation:

-(3a+12)



We get rid of parentheses

6a-3a-12+42=0

We add all the numbers together, and all the variables

3a+30=0

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

3a=-30

a=-30/3

a=-10

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