## Answer :

[tex] \frac{21}{4} - \frac{17}{6} [/tex]

[tex] \frac{21*6}{4*6} -\frac{17*4}{6*4} [/tex]

[tex] \frac{126}{24} - \frac{68}{24} [/tex]

[tex] \frac{126-68}{24} [/tex]

[tex] \frac{58}{24} [/tex]

[tex] 2 \frac{10}{24} [/tex]

[tex]2 \frac{5}{12} [/tex]