a=7^-2

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Solution for a=7^-2 equation: 



a=7^-2

We move all terms to the left:

a-(7^-2)=0

We add all the numbers together, and all the variables

a-0.020408163265306=0

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

a=0.020408163265306

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