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

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



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

We move all terms to the left:

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



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

3(4x+3)

We multiply parentheses

12x+9

Back to the equation:

-(12x+9)



We get rid of parentheses

2x-12x-9-21=0

We add all the numbers together, and all the variables

-10x-30=0

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

-10x=30

x=30/-10

x=-3

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