YOU SAID:
He can't maintain enough equilibrium to ride a bike
INTO JAPANESE
彼は自転車に乗るのに十分な平衡を維持できない
BACK INTO ENGLISH
he is unable to maintain sufficient equilibrium to ride a bicycle
INTO JAPANESE
彼は、自転車に乗るのに十分な平衡を維持することができない
BACK INTO ENGLISH
he is unable to maintain sufficient equilibrium to ride a bicycle
You've done this before, haven't you.