-(-1,7) = (1,7)
(+8,3) = (8,3)
-(+4,35) = (-4,-35)
(-5,65) = -5,65

Adding them all together:

(1,7) + (8,3) - (-4,-35) + (-5,65) =
(1+8-4-5, 7+3-35+65) =
(0, 40)

So the answer is (0,40).