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Explanation:
Piece by piece :
Numerator 5^3 X 5^4 = 5 ^(3+4) = 5^7
Denominator 5^2 X 5^1 = 5^(2+1) = 5^3
so now you have:
5^7 / 5^3 this equals 5 ^(7-3) = 5^4
then (5^4 )^3 = 5^(4x3) = 5 ^12