if 5 ^ 21 x 8 ^ 7 = 10 ^ n what is the value of n ?
5 ^ 21 * ( 2 ^ 3 ) ^ 7 = 10 ^ n or 5 ^ 21 * 2 ^ 21 = 10 ^ n or 10 ^ 21 = 10 ^ n n = 21 c
divide(log(multiply(power(8, 7), power(5, 21))), log(const_10))