Срочно кто может помочь (алгебра)11 класс?

1.

a) 6^2х-1-1/3*6^х-4=0

b) Lg(x-3)+lg(x-45)=2

2. 2log^0,7x=log^0,7(9-8x)

2^x+2^x-3 больше 72
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