2x-9+x=21

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



2x-9+x=21
We move all terms to the left:
2x-9+x-(21)=0
We add all the numbers together, and all the variables
3x-30=0
We move all terms containing x to the left, all other terms to the right
3x=30
x=30/3
x=10

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