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12x+9=14x+27
We move all terms to the left:
12x+9-(14x+27)=0
We get rid of parentheses
12x-14x-27+9=0
We add all the numbers together, and all the variables
-2x-18=0
We move all terms containing x to the left, all other terms to the right
-2x=18
x=18/-2
x=-9
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