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x+12+3x-4=5x-9
We move all terms to the left:
x+12+3x-4-(5x-9)=0
We add all the numbers together, and all the variables
4x-(5x-9)+8=0
We get rid of parentheses
4x-5x+9+8=0
We add all the numbers together, and all the variables
-1x+17=0
We move all terms containing x to the left, all other terms to the right
-x=-17
x=-17/-1
x=+17
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