5x+21=2*(x+21)

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Solution for 5x+21=2*(x+21) equation: 



5x+21=2(x+21)

We move all terms to the left:

5x+21-(2(x+21))=0



We calculate terms in parentheses: -(2(x+21)), so:

2(x+21)

We multiply parentheses

2x+42

Back to the equation:

-(2x+42)



We get rid of parentheses

5x-2x-42+21=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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