(1000-а)*2=40
2000 -2a = 40
- 2a = - 1960
a = 980
(165 + с) : 90 = 2
156 + c/90 = 2
165 + c = 180
c = 180 - 165
c = 15
(1000-а)*2=40
2000 -2a = 40
- 2a = - 1960
- 2a = - 1960
a = 980
(165 + с) : 90 = 2
156 + c/90 = 2
165 + c = 180
c = 180 - 165
c = 15