\[\boxed{\mathbf{2}\mathbf{.}\mathbf{190}}\]
Пояснение.
Решение.
\[\textbf{а)}\ 26 + x + 67 =\]
\[= (26 + 67) + x = 93 + x\]
\[\textbf{б)}\ a - 55 - 28 =\]
\[= a - (55 + 28) = a - 83\]
\[\textbf{в)}\ 79 - 21 - p =\]
\[= (79 - 21) - p = 58 - p\]
\[\textbf{г)}\ 64 - z - 23 =\]
\[= (64 - 23) - z = 41 - z\]