21x=9(x+6)

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Solution for 21x=9(x+6) equation: 



21x=9(x+6)

We move all terms to the left:

21x-(9(x+6))=0



We calculate terms in parentheses: -(9(x+6)), so:

9(x+6)

We multiply parentheses

9x+54

Back to the equation:

-(9x+54)



We get rid of parentheses

21x-9x-54=0

We add all the numbers together, and all the variables

12x-54=0

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

12x=54

x=54/12

x=4+1/2

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