\[(7b - 3) - (b + 6) - (5b - 11) =\]
\[= 7b - 3 - b - 6 - 5b + 11 =\]
\[= b + 2;\]
\[b = 243,8:\]
\[243,8 + 2 = 245,8.\]
\[Ответ:245,8.\]