250 +а=760; 360-с=90; 680-в=620; 50+а=420; с-660=110+220; в-14=640+160

250 +а=760; а=760-250а=510360-с=90; с=360-90с=270680-в=620;в=680-620в=60 50+а=420;а=420-50а=370 с-660=110+220;с-660=330с=330+660с=990 в-14=640+160в-14=800в=800+14в=814