14 $\vdots$ x+3
Hay x+3 $\in$ Ư(14)={1;2;7;14}
Ta có bảng sau :
\begin{array}{|c|c|c|}\hline \text{x+3}&\text{1}&\text{2}&\text{7}&\text{14}\\\hline \text{x}&\text{-2}&\text{-1}&\text{4}&\text{11}\\\hline \text{Kết quả}&\text{Loại}&\text{Loại}&\text{Thỏa mãn}&\text{Thỏa mãn}\\\hline\end{array}
Vậy x=4 ; x=11
CHO MK CTLHN NHA :(