Evaluate
\left(p+et_{c}-t_{c}-w+eb-c_{2}\right)\left(k_{1}+ek+k_{2}\gamma -p\right)
Expand
-p^{2}+c_{2}p+k_{1}p+pt_{c}+ekp-ebp-ept_{c}+pw+k_{2}p\gamma -k_{2}t_{c}\gamma +ek_{2}t_{c}\gamma -k_{1}t_{c}+e^{2}kt_{c}+ek_{1}t_{c}-ekt_{c}-k_{2}w\gamma -k_{1}w-ekw-c_{2}k_{2}\gamma +ebk_{2}\gamma -c_{2}k_{1}+e^{2}bk+ebk_{1}-ec_{2}k
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