7x-3=-x+21

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Solution for 7x-3=-x+21 equation: 



7x-3=-x+21

We move all terms to the left:

7x-3-(-x+21)=0

We add all the numbers together, and all the variables

7x-(-1x+21)-3=0

We get rid of parentheses

7x+1x-21-3=0

We add all the numbers together, and all the variables

8x-24=0

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

8x=24

x=24/8

x=3

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