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8) log₄x = 1/3 log₄ 27; log₄x = log₄ ∛27; x = ∛27; x = 3;
10) lgx = 2 - lg2; lgx = lg100 - lg2; lgx = lg(100 : 2); x = 50;
12) lgx = 4 - lg5 - lg2; lgx = lg (10000 : 5 : 2); lgx = lg 1000; x = 1000;