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12x-4x-5=9x+2
We move all terms to the left:
12x-4x-5-(9x+2)=0
We add all the numbers together, and all the variables
8x-(9x+2)-5=0
We get rid of parentheses
8x-9x-2-5=0
We add all the numbers together, and all the variables
-1x-7=0
We move all terms containing x to the left, all other terms to the right
-x=7
x=7/-1
x=-7
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