she is not doing ... in her room, just lying in her bed

A. anything

B. nothing

C. something

D. one thing

- Beginning: 2; 3
- End: 1; 4

\(MSC:72\)

\(\dfrac{9}{12}=\dfrac{9\times6}{12\times6}=\dfrac{54}{72}\)

\(\dfrac{24}{36}=\dfrac{24\times2}{36\times2}=\dfrac{48}{72}\)

\(\dfrac{3}{8}=\dfrac{3\times9}{8\times9}=\dfrac{27}{72}\)

\(\left(x+3\right)\left(x+5\right)=\left(x+4\right)\left(2+x\right)\)

\(\Leftrightarrow\left(x+3\right)\left(x+5\right)\left(4+x\right)\left(x+2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x+3=0\\x+5=0\\4+x=0\\x+2=0\end{matrix}\right.\)                 \(\Leftrightarrow\left[{}\begin{matrix}x=-3\\x=-5\\x=-4\\x=-2\end{matrix}\right.\)

Vậy phương trình có tập nghiệm là \(S=\left\{-3;-5;-4;-2\right\}\)