Absolute value means how far the value is away from zero. I5I is five spots away from zero, and I-5I is five spots away from five. Absolute value is always positive, so the negative 5 turns into a positive 5. The answer can be different, because absolute value can have different solutions, or no solution at all. Ix- 4I = -6 can't be solved, because absolute value is always positive, or a zero.
I 5 I and I -5 I
5*5 = 25
I 5 I and I -5 I
5*5 = 25