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