All Operations in Mixed Fractions: Complete the missing numbers

$2\frac{1}{2}+?=4$

$1\frac{1}{2}$

$?-2\frac{1}{3}=1\frac{2}{4}$

$4\frac{1}{12}$

$?-2\frac{1}{4}=5\frac{2}{4}$

$7\frac{3}{4}$

$3\frac{2}{3}+?=6$

$2\frac{1}{3}$

$?-4\frac{1}{7}=1\frac{3}{7}$

$5\frac{4}{7}$

$5\frac{2}{7}+?=6\frac{3}{7}$

$1\frac{1}{7}$

$5\frac{3}{4}+?=7\frac{1}{2}$

$1\frac{3}{4}$

$?-5\frac{5}{6}=1\frac{2}{3}$

$7\frac{1}{2}$