Odpowiedź:
4 i 3/7 + x = 7 i 6/7
x = 7 i 6/7 - 4 i 3/7
x = 3 i 3/7
3 i 3/5 + x = 7 i 1/5
x = 7 i 1/5 - 3 i 3/5
x = 6 i 6/5 - 3 i 3/5
x = 3 i 3/5
x - 11 i 2/3 = 4 i 2/3
x = 4 i 2/3 + 11 i 2/3
x = 15 i 4/3 = 16 i 1/3
12 i 5/7 - x = 4 i 3/7
x = 12 i 5/7 - 4 i 3/7
x = 8 i 2/7