The net change of temperatures between the planets is required.
Neptune to Mars is [tex]154^{\circ}\text{C}[/tex]
Earth to Neptune is [tex]228^{\circ}\text{C}[/tex]
Venus to Earth is [tex]446^{\circ}\text{C}[/tex]
The net change value is the distance of the net change from zero.
So, the absolute value of the change will be the net change.
Difference in temperature of Neptune and Mars
[tex]|-214-(-60)|=154^{\circ}\text{C}[/tex]
Difference in temperature of Neptune and Earth
[tex]|-214-14|=228^{\circ}\text{C}[/tex]
Difference in temperature of Venus and Earth
[tex]|460-14|=446^{\circ}\text{C}[/tex]
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