Answer
$-1\dfrac{3}{4}$
Work Step by Step
Make the fractions similar using their LCD of $12$:
$=-\dfrac{2(4)}{3(4)}+\left(-\dfrac{5(2)}{6(2)}\right)-\dfrac{1(3)}{4(3)}
\\=-\dfrac{8}{12} + \left(-\dfrac{10}{12}\right) - \dfrac{3}{12}
\\=\dfrac{-8-10-3}{12}
\\=-\dfrac{21}{12}
\\=-1\dfrac{9}{12}
\\=-1\dfrac{3}{4}$
