12x+5-3x+9=3x-9-4x+21

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Solution for 12x+5-3x+9=3x-9-4x+21 equation: 



12x+5-3x+9=3x-9-4x+21

We move all terms to the left:

12x+5-3x+9-(3x-9-4x+21)=0

We add all the numbers together, and all the variables

12x-3x-(-1x+12)+5+9=0

We add all the numbers together, and all the variables

9x-(-1x+12)+14=0

We get rid of parentheses

9x+1x-12+14=0

We add all the numbers together, and all the variables

10x+2=0

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

10x=-2

x=-2/10

x=-1/5

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