7^3 : 7^(-1) = 7^(3 - (-1)) = 7^(3 + 1) = 7^4
(-5)^8 : (-5)^10 = 5^(8 - 10) = 5^(-2)
(+9)^11 : (+9)^(-12) = 9^(11 - (-12)) = 9^(11 + 12) = 9^23
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