42 6 42 6 42 6 21
---------------------- - ----- = ----------------- - ----- = ---------- - ------ = ----- -
((7*-68)-(-68*-68) -68 -476 + 4624 -68 4148 -68 2074
6 42- 366 -324 162 81
----- = --------------- = ---------------- = ------------ = ------------
-68 4148 4148 2074 1037
как то так)