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9+4x=21-2x
We move all terms to the left:
9+4x-(21-2x)=0
We add all the numbers together, and all the variables
4x-(-2x+21)+9=0
We get rid of parentheses
4x+2x-21+9=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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