Đáp án:
Giải thích các bước giải:
$-7x-11$ $\vdots$ $2x+4$
$⇒-14x-22$ $\vdots$ $2x+4$
$⇒-14x-28+28-22$ $\vdots$ $2x+4$
$⇒-7.(2x+4)+6$ $\vdots$ $2x+4$
$⇒6$ $\vdots$ $2x+4$
$⇒2x+4∈${$6;3;2;1;-1;-2;-3;-6$}
$⇒x∈${$1;$$\dfrac{-1}{2}$;$-1;$$\dfrac{-3}{2}$;$\dfrac{-5}{2}$;$-3$;$\dfrac{-7}{2}$;$-5$}