1/ -16 + 23 + x = -16
⇔ 7 + x = -16
⇔ x = -16 -7
⇔ x = -23
2/ 2x - 35 = 15
⇔ 2x = 15 + 35
⇔ 2x = 50
⇔ x = 25
3/ 3x + 17 = 12
⇔ 3x = 12 - 17
⇔ 3x = -5
⇔ x = $\frac{-5}{3}$
4/ | x - 1 | = 0
⇔ x -1 = 0
⇔ x = 1
5/ -13 . | x | = -26
⇔ | x | = $\frac{-26}{-13}$
⇔ | x | = 2
⇔ \(\left[ \begin{array}{l}x=2\\x=-2\end{array} \right.\)