book Maths Puzzle Numerical Ability

At what point or why do we change the original inequality symble from < to > and vise versa
eg
(1) -2x < -8
-2x/2 > -8/-2
x > 4

(2) 3x/3 < 17/3
x < 17/3

Why did < change to > in eg (1) and not in eg (2)

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