[tex](-1 \frac{3}{5} +2 \frac{1}{4} )* (3 \frac{4}{7} - \frac{65}{14} )=[/tex]
[tex]=(- \frac{8}{5} + \frac{9}{4} )* ( \frac{25}{7} - \frac{65}{14} )= [/tex]
[tex]=(- \frac{4*8}{4*5} + \frac{5*9}{5*4} )* ( \frac{2*25}{2*7} - \frac{65}{14} )= [/tex]
[tex]=(- \frac{32}{20} + \frac{45}{20} )* ( \frac{50}{14} - \frac{65}{14} )= [/tex]
[tex]=\frac{13}{20} * ( - \frac{15}{14} )= - \frac{13*3}{4*14}=- \frac{39}{56} [/tex]
