possible solution of 4x + 7y = 3 -500<= x <= 500 , -500 <=y <= 500

are x=6 , y= -3

x=13 , y=-7

```
x=-1 , y= 1
x= -8 y=5
```

so x has a gap of 7 units 497/7 = 71 ,, so last term is - 498 ,, ,,,,,,,,,, - 1 , 6 , 13 ,,,,,,,, 496

so we get 143 terms , so our answer is 143