Ответы и объяснения

2013-12-08T21:47:09+04:00
(6y +14) : 2 + 15 = 40
3y + 7 + 15 = 40
3y = -7 -15 -40
3y = 18
y = 18 : 3
y = 6
2013-12-08T21:48:24+04:00