1/3(21-3a)=6+a

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Solution for 1/3(21-3a)=6+a equation: 



1/3(21-3a)=6+a

We move all terms to the left:

1/3(21-3a)-(6+a)=0



Domain of the equation: 3(21-3a)!=0

a∈R



We add all the numbers together, and all the variables

1/3(-3a+21)-(a+6)=0

We get rid of parentheses

1/3(-3a+21)-a-6=0

We multiply all the terms by the denominator


-a*3(-3a+21)-6*3(-3a+21)+1=0

Wy multiply elements

-3a^2(--18a(-+1=0

We use the square of the difference formula

-3a^2(+18a(-1=0

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