Explicație pas cu pas:
a) |x| = 5
x = - 5 sau x = 5
b) |x| = -1
(absurd) => x = Ø
c) |2x-1| = 7
2x - 1 = -7 => 2x = -7+1 => 2x = -6 => x = -6:2 => x = -3
sau
2x - 1 = 7 => 2x = 7 + 1 => 2x = 8 => x = 8:2 => x = 4
d) |-x+2| = 1-51 <=> |-x+2| = - 50
(absurd) => x = Ø