3x+3=21-x

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Solution for 3x+3=21-x equation: 



3x+3=21-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(-1x+21)+3=0

We get rid of parentheses

3x+1x-21+3=0

We add all the numbers together, and all the variables

4x-18=0

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

4x=18

x=18/4

x=4+1/2

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