x+21=42-2x

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Solution for x+21=42-2x equation: 



x+21=42-2x

We move all terms to the left:

x+21-(42-2x)=0

We add all the numbers together, and all the variables

x-(-2x+42)+21=0

We get rid of parentheses

x+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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