Hey there!!
Simple equation :
mᵃ × mᵇ = m ᵃ⁺ᵇ
We have :
5⁻⁷ * 5¹² * 5⁻²
... 5⁻⁷⁺¹²⁻²
... 5¹²⁻⁹
... 5³
... 125
Hope my answer helps!!
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