You can't "do" anything unless you know the value of x.
x + 10
x + 5
x + 5; provided, of course, that x ≠ -10.
10
(-x3 + 75x - 250) / (x + 10) = x2 - 10x - 25
2 plus 1-x divided by.
18 + 6 + 2 = 26
10 plus 10 divided by 4 is 12.5
It simplifies to: 8x+1.25
3x + x + 10 + x = 5x + 10
x + 3
x + 5