Verified answer

Ответ: 17

Объяснение:

CD = CE - DE

CD = (x + 30) - 10 = x + 20

BC = BD - CD

BC = (31 + x) - (x + 20) = 31 + x - x - 20 = 11

BC = 3x + 50, поэтому

3х + 50 = 11

3x = 11 - 50

3x = - 39

x = - 13

Итак,

DE = 10,

CD = x + 20 = - 13 + 20 = 7

CE = DE + CD = 10 + 7 = 17