Срочно!!! Кто решит–40 балов х+2 1/3+3 1/9-1 1/12=5 7/12

Решите задачу:

$x+2 \frac{1}{3} +3 \frac{1}{9} -1 \frac{1}{12} =5 \frac{7}{12} ;$
$x+ \frac{7}{3} +\frac{28}{9} - \frac{13}{12} =\frac{67}{12} ;$
$x+ \frac{21}{9} +\frac{28}{9}=\frac{67}{12}+\frac{13}{12};$
$x+ \frac{49}{9}=\frac{80}{12};$
$x=\frac{80}{12}- \frac{49}{9} = \frac{240-196}{36} = \frac{44}{36} = \frac{11}{9} =1 \frac{2}{9}$