2x-3+3+9=21

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Solution for 2x-3+3+9=21 equation: 



2x-3+3+9=21

We move all terms to the left:

2x-3+3+9-(21)=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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