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