6x+21=3(4x+21)

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Solution for 6x+21=3(4x+21) equation: 



6x+21=3(4x+21)

We move all terms to the left:

6x+21-(3(4x+21))=0



We calculate terms in parentheses: -(3(4x+21)), so:

3(4x+21)

We multiply parentheses

12x+63

Back to the equation:

-(12x+63)



We get rid of parentheses

6x-12x-63+21=0

We add all the numbers together, and all the variables

-6x-42=0

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

-6x=42

x=42/-6

x=-7

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