Đáp án: $x=\dfrac{279}{77}$
Giải thích các bước giải:
$\dfrac{2}{3}(x-6)-\dfrac{1}{4}(3+x)=-1\dfrac{3}{7}\\\Leftrightarrow \dfrac{2}{3}x-4-\dfrac{3}{4}+\dfrac{1}{4}x=-\dfrac{10}{7}\\\Leftrightarrow \dfrac{2}{3}x+\dfrac{1}{4}x=4+\dfrac{3}{4}-\dfrac{10}{7}\\\Leftrightarrow \dfrac{11}{12}x=\dfrac{93}{27}\\\Leftrightarrow x=\dfrac{279}{77}$