21=2(4x+9)

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



21=2(4x+9)

We move all terms to the left:

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



We calculate terms in parentheses: -(2(4x+9)), so:

2(4x+9)

We multiply parentheses

8x+18

Back to the equation:

-(8x+18)



We get rid of parentheses

-8x-18+21=0

We add all the numbers together, and all the variables

-8x+3=0

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

-8x=-3

x=-3/-8

x=3/8

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