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12-5x=9-4x
We move all terms to the left:
12-5x-(9-4x)=0
We add all the numbers together, and all the variables
-5x-(-4x+9)+12=0
We get rid of parentheses
-5x+4x-9+12=0
We add all the numbers together, and all the variables
-1x+3=0
We move all terms containing x to the left, all other terms to the right
-x=-3
x=-3/-1
x=+3
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