What is the value of AAA when we rewrite \left(\dfrac 56\right)^{x}( 6 5 ​ ) x left parenthesis, start fraction, 5, divided by, 6, end fraction, right parenthesis, start superscript, x, end superscript as A^{-8x}A −8x A, start superscript, minus, 8, x, end superscript ?