РЕШЕНИЕ:

__10__ − __2c__ : __2c__ − c+4 =
c−2_____ c²−4 ___ (c+2)² __ c−2

__10__ − __2c____ ∙ (c+2)(c+2) − c+4 =
c−2_____ (c−2)(c+2) ___ 2c _____ c−2

10 − (c+2) − (c+4) =
c−2

10 − c – 2 − c – 4 =
c−2

4 − 2c =
c−2

−2 (c – 2) = –2
c−2

Ответ: –2