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

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



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

We move all terms to the left:

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

We multiply parentheses

21a+4a-(5(3a+3))-12=0



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

5(3a+3)

We multiply parentheses

15a+15

Back to the equation:

-(15a+15)



We add all the numbers together, and all the variables

25a-(15a+15)-12=0

We get rid of parentheses

25a-15a-15-12=0

We add all the numbers together, and all the variables

10a-27=0

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

10a=27

a=27/10

a=2+7/10

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