Решить уравнение 8^9-x=64^x
8^(9-x)=64^x
2^(3(9-x)) = 2^6x
2^(27-3x) = 2^6x
2^27 / 2^3x =2^6x
2^27 = 2^6x * 2^3x
2^27 = 2^9x
27=9x
x=3