Solve the following expression
$\frac{-3}{4} +\frac{2}{3} -\frac{6}{7}$

Given: $\frac{-3}{4} +\frac{2}{3} -\frac{6}{7}$

To do: Solve the given expression.

Solution:

LCM of 3,4,7 is 84

= $\frac{-3\times21}{4\times21} + \frac{2\times28}{3\times28}-\frac{6\times12}{7\times12}$

= $\frac{-63}{84} + \frac{56}{84} -\frac{72}{84} $

= $\frac{-63+56-72}{84}$

Therefore the value of given expression is  $\frac{-79}{84}$