(Х–315)–27=36 872–(407+с)=122
Х-315-27=36; х-288=36; х=288+36; х=324
1)(х-315)-27=36 2)872-(407+с)=122 х-315=36+27 407+с=872-122 х-315=63 407+с=750 х=63+315 с=750-407 х=378 с=343 (378-315)-27=36 872-(407+с)=122