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Ответ:

Решил на фотографии.

[tex]\frac{15}{16} b+\frac{1}{2} +1\frac{3}{4} b+2\frac{1}{8} =5\frac{5}{16}\\\\\frac{15}{16} b+\frac{1}{2} +\frac{7}{4} b+\frac{17}{8} =\frac{85}{16} \\\\\frac{15}{16} b+\frac{7}{4} b=\frac{85}{16} -\frac{17}{8} -\frac{1}{2} \\\\\frac{15+28}{16} b=\frac{85-34-8}{16} \\\\\frac{43}{16} b=\frac{43}{16} \\\\b=1[/tex]