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3(2x+1)-x=9-4x+12
We move all terms to the left:
3(2x+1)-x-(9-4x+12)=0
We add all the numbers together, and all the variables
3(2x+1)-x-(-4x+21)=0
We add all the numbers together, and all the variables
-1x+3(2x+1)-(-4x+21)=0
We multiply parentheses
-1x+6x-(-4x+21)+3=0
We get rid of parentheses
-1x+6x+4x-21+3=0
We add all the numbers together, and all the variables
9x-18=0
We move all terms containing x to the left, all other terms to the right
9x=18
x=18/9
x=2
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