1)5^5x+1,5=25 2)6^6x-9=219 3)2^8-13x=1//32 4)7^1,2x+0,6=1//343 5)10^21-6x=0,001

1) 5^(5x - 1,5) =5^2;  5x - 1,5 = 2;  5x = 3,5;  x = 0,7. 2)6^(6x - 9) = 216;  6^(6x - 9) = 6^3;  6x - 9 =3; 6x = 12; x = 2. 3) 2^(8 - 13 x) = (1/2)^5; 2^(8 -13 x ) = 2^(-5); 8 - 13 x = -5; - 13 x = - 13; x =1. 4) 7^(1,2 x + 0,7) = 7^(-3); 1,2 x + 0,6 = -3;  1,2 x = - 3,6;  x = 3.  5) 10^(21 - 6x) = 10^(-3);  21 - 6x = -3;  - 6x = - 24;  x= 4.