Решение 

`and`(diff(y(x), x) = diff(`+`(12, `*`(12, `*`(x)), `-`(`*`(2, `*`(`^`(x, `/`(3, 2)))))), x), `and`(diff(`+`(12, `*`(12, `*`(x)), `-`(`*`(2, `*`(`^`(x, `/`(3, 2)))))), x) = `+`(12, `-`(`*`(`*`(2, `/`(... 

solve(diff(`+`(12, `*`(12, `*`(x)), `-`(`*`(2, `*`(x, `*`(sqrt(x)))))), x) = 0) 

16 (19.2.1)