8x+3=21-x

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Solution for 8x+3=21-x equation: 



8x+3=21-x

We move all terms to the left:

8x+3-(21-x)=0

We add all the numbers together, and all the variables

8x-(-1x+21)+3=0

We get rid of parentheses

8x+1x-21+3=0

We add all the numbers together, and all the variables

9x-18=0

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

9x=18

x=18/9

x=2

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