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125² * 25^-4,5
5^18 * x = 5
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5^6 * 5^-9
5^18 * x = 5 /* (5^3)/(5^18)
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5^3
x= 5 * (5^3)/(5^18)
x= 5^(-14)
odpowiedź to pięć do potęgi minus 14.