2x+x+12=21

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Solution for 2x+x+12=21 equation: 



2x+x+12=21

We move all terms to the left:

2x+x+12-(21)=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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