[tex]\bf - \dfrac{7}{3}- \dfrac{1}{5}-\dfrac{3}{2}=[/tex]
[tex]\bf - \dfrac{7\cdot10}{30}- \dfrac{6\cdot1}{30}-\dfrac{3\cdot 15}{30}=[/tex]
[tex]\bf - \dfrac{(7+6+45)}{30}=[/tex]
[tex]\boxed{\bf - \dfrac{121}{30}}\:\: sau\:\:\boxed{\bf - 4\dfrac{1}{30}}[/tex]
