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3+12x=9+2x
We move all terms to the left:
3+12x-(9+2x)=0
We add all the numbers together, and all the variables
12x-(2x+9)+3=0
We get rid of parentheses
12x-2x-9+3=0
We add all the numbers together, and all the variables
10x-6=0
We move all terms containing x to the left, all other terms to the right
10x=6
x=6/10
x=3/5
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