3^-x=3.5

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Solution for 3^-x=3.5 equation: 



3^-x=3.5

We move all terms to the left:

3^-x-(3.5)=0

We add all the numbers together, and all the variables

-1x+0.021383343303319=0

We move all terms containing x to the left, all other terms to the right

-x=-0.021383343303319

x=-0.021383343303319/-1

x=0.021383343303319/1

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