Bài 7:
`a)`
\(\left\{ \begin{array}{l}3m - 1 = 2\\m + 3 \ne -1\end{array} \right.\)
`<=>` \(\left\{ \begin{array}{l}m = 1\\m \ne -4\end{array} \right.\)
`=> m = 1`
`b)`
\(\left\{ \begin{array}{l}m = 2m + 3\\2m \ne -m + 1\end{array} \right.\)
`<=>` \(\left\{ \begin{array}{l}m = -3\\m \ne \dfrac{1}{3}\end{array} \right.\)
`=> m = -3`
Bài 8:
`a)` Ảnh `1, 2`
`b)` Ảnh `3, 4`
