3=21-2x

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Solution for 3=21-2x equation: 



3=21-2x

We move all terms to the left:

3-(21-2x)=0

We add all the numbers together, and all the variables

-(-2x+21)+3=0

We get rid of parentheses

2x-21+3=0

We add all the numbers together, and all the variables

2x-18=0

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

2x=18

x=18/2

x=9

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