2-2 = 4
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6 to the negative 2nd means that it equals 1 over 6 to the negative 2nd.
It is: 3-1*3-2 = 1/27
a, a^3*a^-2 is a^3+-2 which equals just a
The answer to -7^2 = +49. Remember, a negative times a negative is a positive as in this case.
1/2-2 = 1/(1/22) = 22 = 4