$\text{1) $\dfrac{x}{14}$ = $\dfrac{-6}{15}$}$
$\text{⇒ 15x = 14.(-6)}$
$\text{15x = (-84)}$
$\text{x = (-84) ÷ 15}$
$\text{x = (-5,6)}$
$\text{Vậy x = (-5,6)}$
$\text{2) 3x ÷ 2,7 = $\dfrac{1}{3}$ ÷ 2$\dfrac{1}{4}$}$
$\text{3x ÷ 2,7 = $\dfrac{1}{3}$ ÷ $\dfrac{9}{4}$}$
$\text{3x ÷ $\dfrac{27}{10}$ = $\dfrac{4}{27}$ }$
$\text{3x = $\dfrac{4}{27}$ × $\dfrac{27}{10}$ }$
$\text{3x = $\dfrac{2}{5}$ }$
$\text{x = $\dfrac{2}{5}$ ÷ 3}$
$\text{x = $\dfrac{2}{15}$}$