9x-21=3(x-7)+6

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Solution for 9x-21=3(x-7)+6 equation: 



9x-21=3(x-7)+6

We move all terms to the left:

9x-21-(3(x-7)+6)=0



We calculate terms in parentheses: -(3(x-7)+6), so:

3(x-7)+6

We multiply parentheses

3x-21+6

We add all the numbers together, and all the variables

3x-15

Back to the equation:

-(3x-15)



We get rid of parentheses

9x-3x+15-21=0

We add all the numbers together, and all the variables

6x-6=0

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

6x=6

x=6/6

x=1

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