2x-7+4+x=21

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Solution for 2x-7+4+x=21 equation: 



2x-7+4+x=21

We move all terms to the left:

2x-7+4+x-(21)=0

We add all the numbers together, and all the variables

3x-24=0

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

3x=24

x=24/3

x=8

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