3x+9-x=21-8x-12

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Solution for 3x+9-x=21-8x-12 equation: 



3x+9-x=21-8x-12

We move all terms to the left:

3x+9-x-(21-8x-12)=0

We add all the numbers together, and all the variables

3x-x-(-8x+9)+9=0

We add all the numbers together, and all the variables

2x-(-8x+9)+9=0

We get rid of parentheses

2x+8x-9+9=0

We add all the numbers together, and all the variables

10x=0

x=0/10

x=0

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