Order of Operation

I.N.

Solve:
1. (2 x 5) + 7 - 9 =
2. (3 - 4) + (10 x 14) =

Add parenthesis:
3. 5 + 6 - 3 x 2 - 1 = 17

answers:
1. 8
2. 139
3. (5 + 6) - 3 x 2 - 1 = 17