a) `|x + 7| - 2 = 0`
`⇒ |x + 7| = 2`
`⇒` \(\left[ \begin{array}{l}x + 7=2\\x + 7=-2\end{array} \right.\)
`⇒` \(\left[ \begin{array}{l}x = - 5\\x + 7=-9\end{array} \right.\)
b) `x. (x + 2 = 0`
`⇒` \(\left[ \begin{array}{l}x=0\\x + 2 =0\end{array} \right.\)
`⇒` \(\left[ \begin{array}{l}x=0\\x =-2\end{array} \right.\)
c) `(x - 1). (x - 2) = 0`
`⇒` \(\left[ \begin{array}{l}x - 1=0\\x - 2=0\end{array} \right.\)
`⇒` \(\left[ \begin{array}{l}x=1\\x =2\end{array} \right.\)
