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2x^-6x+9=12.5
We move all terms to the left:
2x^-6x+9-(12.5)=0
We add all the numbers together, and all the variables
-4x-3.5=0
We move all terms containing x to the left, all other terms to the right
-4x=3.5
x=3.5/-4
x=-2.3333333333333/2.6666666666667
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