Your question is not clearly stated. Do you mean the difference between 10 * 10 * x, and 7 * 7 * 7 *x ? Then the number is x = 119/243. That's about 0.48971... in decimal form.
It's confusing when you say the "difference of a number". Differences are BETWEEN two numbers. See what I mean?
Set

The region
is given in polar coordinates by the set

So we have

Answer:
8
Step-by-step explanation:
10+8-3+5-12=