4^x-6·2^x+8=0,
(2^x)^2-6·2^x+8=0,
2^x=a,
a^2-6a+8=0,
a1=2, a2=4,
2^x=2, 2^x=2^1, x=1,
2^x=4, 2^x=2^2, x=2;
14^26x-14^(26x-1)=13,
13*14^(26x-1)=13,
14^(26x-1)=1,
14^(26x-1)=14^0,
26x-1=0,
26x=1,
x=1/26,
2^x+2^(x-3)=18,
2^x (1+2^(-3))=18,
2^x (1+1/8)=18,
9/8 *2^x=18,
2^x=16,
2^x=2^4,
x=4.
4^x-6·2^x+8=0,
(2^x)^2-6·2^x+8=0,
2^x=a,
a^2-6a+8=0,
a1=2, a2=4,
2^x=2, 2^x=2^1, x=1,
2^x=4, 2^x=2^2, x=2;
14^26x-14^(26x-1)=13,
13*14^(26x-1)=13,
14^(26x-1)=1,
14^(26x-1)=14^0,
26x-1=0,
26x=1,
x=1/26,
2^x+2^(x-3)=18,
2^x (1+2^(-3))=18,
2^x (1+1/8)=18,
9/8 *2^x=18,
2^x=16,
2^x=2^4,
x=4.