10¹² / 10ˣ = 10⁹
10¹²⁻ˣ = 10⁹
12-x = 9
-x = 9-12
-x = -3 / · (-1)
x=3
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10^{12-x}=10⁹
z rownosci podstaw wnosimy o rownosci wykladnikow
12-x=9
x=3
10¹² / 10ˣ = 10⁹
10¹²⁻ˣ = 10⁹
12-x = 9
-x = 9-12
-x = -3 / · (-1)
x=3