It is so very simple and quick to get the answer, especially since you can use the calculator that comes with your computer. But since you are obviously not able to do so, the answer is -79.
276
125 + 125 + 125 + 125 + 125 + 125 =125 * 6 =(100 * 6) + (20 * 6) + (5 * 6) =600 + 120 + 30 =600 + 100 + 20 + 30 =700 + 50 =750
125 + 125 = 250
46+46=92.
46 + 46 = 92
46 + 29 = 75
123 124 + 125 ------ 372
125 + 30 + 25 = 180
92
658
-33
29 + 33 + 46 = 108