c program ,can someone help me

Question

#include <stdio.h>
int main(void)
{
int a;
int b = 1;
int x[5] = { 1, 2, 3, 4, 5 };
a = 5 * 4 + x[b++] - (9 / b);
printf("%d", a);
return 0;
}
Output: 18

Answer 1

What is the precedence order here

Answer 2

Isn't paranthesis solved first
You know precedency ,associativity right