21=3x+3(x-5)

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Solution for 21=3x+3(x-5) equation: 



21=3x+3(x-5)

We move all terms to the left:

21-(3x+3(x-5))=0



We calculate terms in parentheses: -(3x+3(x-5)), so:

3x+3(x-5)

We multiply parentheses

3x+3x-15

We add all the numbers together, and all the variables

6x-15

Back to the equation:

-(6x-15)



We get rid of parentheses

-6x+15+21=0

We add all the numbers together, and all the variables

-6x+36=0

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

-6x=-36

x=-36/-6

x=+6

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