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3x=9+12-x/2
We move all terms to the left:
3x-(9+12-x/2)=0
We add all the numbers together, and all the variables
3x-(-x/2+21)=0
We get rid of parentheses
3x+x/2-21=0
We multiply all the terms by the denominator
3x*2+x-21*2=0
We add all the numbers together, and all the variables
x+3x*2-42=0
Wy multiply elements
x+6x-42=0
We add all the numbers together, and all the variables
7x-42=0
We move all terms containing x to the left, all other terms to the right
7x=42
x=42/7
x=6
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