2x-9=21-3x

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



2x-9=21-3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2x+3x-21-9=0

We add all the numbers together, and all the variables

5x-30=0

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

5x=30

x=30/5

x=6

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