My undergrad is in computer science and my masters is in software engineering. Lets just say I've had LOOOOTS of math.
What your doing there in high school is called "Classical Algebra" (finding unknown numbers). One of the "upper" math classes i took in college was Abstract Algebra (studying rings, fields-space & time).
I understand that the phrase "difficult" is relative to each person..but there is really nothing hard about classical algebra. The concepts are old...i mean..old old. What your studying now, was first developed by the ancient Babylonians, they could even solve quadratic equations, using the same methods your learning now. And that was like 4,000 years ago...think about that for just a min.
Why is it important to study it?
Because while your shooting at that target 100 yards away, the guy who studied the math is guiding a non-manned drone your way to drop a missile on you.
Is higher math for everybody? Of course not...SOMEBODY has to be on the ground to drop the missiles on!