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Jayden spends a winter day recording the temperature once every three hours for science class. At $9$ am, the temperature was $-3.4^{\circ} \mathrm{F}$. Between $9$am and noon, the temperature rose $2.8^{\circ} \mathrm{F}$. Between noon and $3 \mathrm{pm}$, the temperature increased by $8^{\circ} \mathrm{F}$. Between $3 \mathrm{pm}$ and $6 \mathrm{pm}$, the temperature went down $7.5^{\circ} \mathrm{F}$. What was the temperature at $6 \mathrm{pm}$ ?$\newline$Answer: $\square$ ${ }^{\circ} \mathrm{F}$