3+9x=21+x

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Solution for 3+9x=21+x equation: 



3+9x=21+x

We move all terms to the left:

3+9x-(21+x)=0

We add all the numbers together, and all the variables

9x-(x+21)+3=0

We get rid of parentheses

9x-x-21+3=0

We add all the numbers together, and all the variables

8x-18=0

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

8x=18

x=18/8

x=2+1/4

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