2x+6+9=21

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Solution for 2x+6+9=21 equation: 



2x+6+9=21

We move all terms to the left:

2x+6+9-(21)=0

We add all the numbers together, and all the variables

2x-6=0

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

2x=6

x=6/2

x=3

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