a
[tex] - 15 - x = 42[/tex]
[tex] - x = 57[/tex]
[tex]x = - 57[/tex]
b
[tex] |2x - 5| = 17[/tex]
avem doua cazuri
[tex]2x - 5 = 17 = > 2x = 22 = > x = 11[/tex]
sau
[tex]2x - 5 = - 17 = > 2x = - 12 = > x = - 6[/tex]
c
[tex]12(7x - 15) = - 156 = > 7x - 15 = - 13 = > 7x =2 = > x = \frac{2}{7} [/tex]
COROANA?