-312 (78*4)
= 80 (bring down a zero from the top)
-78 (78*1)
= 20 (bring down a zero from the top)
-0 (78*0)
= 200 (bring down a zero from the top)
-156 (78*2)
= 440 (bring down a zero from the top)
-390 (78*5)
= 500 (bring down a zero from the top)
-468 (78*6)
= 320 (bring down a zero from the top)
-312 (78*4)
= 80 (bring down a zero from the top)
-78 (78*1)
= 20 (bring down a zero from the top)
-0 (78*0)
= 200 (bring down a zero from the top)
-156 (78*2)
= 440 (bring down a zero from the top)
-390 (78*5)
= 500 (bring down a zero from the top)
...
Can you notice what's happening, the whole process repeats itself over and over again (i.e. "641025" is recurring)
Thus, 5000/7800 or 7800 ) 5000 = 0,'641025' (')=recurring Which is: 0,64102564102564102564102564102564102564…
... (This carries on to infinity)