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3x+9-2x=6+21+2x
We move all terms to the left:
3x+9-2x-(6+21+2x)=0
We add all the numbers together, and all the variables
3x-2x-(2x+27)+9=0
We add all the numbers together, and all the variables
x-(2x+27)+9=0
We get rid of parentheses
x-2x-27+9=0
We add all the numbers together, and all the variables
-1x-18=0
We move all terms containing x to the left, all other terms to the right
-x=18
x=18/-1
x=-18
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