0,25*4^(6x-20)=(√2/4)^(-x)

(1/2)^2*2^2(6x-20)=(2^1/2/2^2)^(-x) 2^ -2*2^12x-40=2^2x/2^1/2x -2+12x-40=2x-1/2x 12x-42=2x-1/2x -6=-84x x=14