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