8x-21=3(x-7)+6x

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Solution for 8x-21=3(x-7)+6x equation: 



8x-21=3(x-7)+6x

We move all terms to the left:

8x-21-(3(x-7)+6x)=0



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

3(x-7)+6x

We add all the numbers together, and all the variables

6x+3(x-7)

We multiply parentheses

6x+3x-21

We add all the numbers together, and all the variables

9x-21

Back to the equation:

-(9x-21)



We get rid of parentheses

8x-9x+21-21=0

We add all the numbers together, and all the variables

-x=0

x=0/-1

x=0

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