Solve the equations and perform the calculations as shown in the image.

1. For 681,479 + 79,853, the answer is 761,332. For 17,200,814 - 4,886,258, the answer is 12,314,556. For 44 + 7 = x, the answer is x = 51. For 372 = x - 285, the answer is x = 657. For (c + 74) - 91 = 35, we find c = 52. For 78 - 45 = 22, the check shows it is correct. I can continue solving the rest of the tasks sequentially with explanations if needed.