3-demethylubiquinol-7 + S-adenosyl-L-methionine <=> ubiquinol-7 + S-adenosyl-L-homocysteine + H(+)
3-demethylubiquinol-7 + s-adenosyl-l-methionine <=> ubiquinol-7 + s-adenosyl-l-homocysteine + h(+)
3-demethylubiquinol-7 + S-adenosyl-L-methionine <=> ubiquinol-7 + S-adenosyl-L-homocysteine + H(+)
3-demethylubiquinol-7 + s-adenosyl-l-methionine <=> ubiquinol-7 + s-adenosyl-l-homocysteine + h(+)