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

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



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

We move all terms to the left:

3x+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

3x-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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