25x2 - 15 is not an equation so it cannot be solved.
45 - 15 - 15 = 15
y(5x - 4)(5x + 7)
xsquared minus x minus 72
15 minus 8.75 is 6.25
32 minus 15 is 17.
458 minus 15 is 443.
-31
800 minus 15 percent = 680
47.00 minus 15 percent is 39.95
3 - (-12) = 3 + 12 = 15.
The difference is 29.95 minus 15 = 14.95
If you mean 1130 minus 15 minus 16 then it is 1099