Verified answer

[tex]-3,2+a=-5\\a=-5+3,2\\a=-1,8\\\\[/tex]

[tex] m-5\frac{3}{4}=-7\frac{5}{6} \\m=-7\frac{5}{6}+5\frac{3}{4}\\m=-(7\frac{5*4}{24}-5\frac{3*6}{24})\\m=-(7\frac{20}{24}-5\frac{18}{24})\\m=-(2\frac{20-18}{24})\\m=-2\frac{2}{24})\\m=-2\frac{1}{12})[/tex]

Ответ: а)[tex]-1,8[/tex]; б)[tex]-2\frac{1}{12}[/tex]