Ответ:

[tex] \displaystyle \frac{ \not6}{ \not5} \times ( - 26) \times \frac{ \not5}{ \not3} \times ( - \frac{4}{13} ) + ( - 2) \times 2 =2 \times 2 \times 4 - 2 \times 2 = 16 - 4 = \bf \: 12[/tex]