3x+9x=123+21

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Solution for 3x+9x=123+21 equation: 



3x+9x=123+21

We move all terms to the left:

3x+9x-(123+21)=0

We add all the numbers together, and all the variables

3x+9x-144=0

We add all the numbers together, and all the variables

12x-144=0

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

12x=144

x=144/12

x=12

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