2X+3+x=21

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Solution for 2X+3+x=21 equation: 



2X+3+X=21

We move all terms to the left:

2X+3+X-(21)=0

We add all the numbers together, and all the variables

3X-18=0

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

3X=18

X=18/3

X=6

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