[tex]\frac{2 }{65}+\frac{43}{42}- \frac{59}{7} =\frac{42\cdot 2}{2730} + \frac{ 65\cdot 43}{2730}- \frac{390\cdot 59}{2730}= \frac{84}{2730} + \frac{2795}{2730}- \frac{23010}{2730}=\\\\ =\frac{84+2795-23010}{2730} = -\frac{20131}{2730}= -7\frac{1021}{2730}[/tex]
