9x-21=3(2x-4)

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Solution for 9x-21=3(2x-4) equation: 



9x-21=3(2x-4)

We move all terms to the left:

9x-21-(3(2x-4))=0



We calculate terms in parentheses: -(3(2x-4)), so:

3(2x-4)

We multiply parentheses

6x-12

Back to the equation:

-(6x-12)



We get rid of parentheses

9x-6x+12-21=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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