Perform the following operations:
8.) (48 - 2x + 5a + 7) + (3&° +8a - 9a -
9.) (23r - 75 + 6t) - (18r - 32s + 2t)
10.) 38m:- 27mn + 44n:
- (52m: - 46mn + 59n:)
on​