Permission denied/adb push

Trying to deodex my apks, they're deodexed but I can't push them into the /system/app folder

Code:

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C:\Users\Terrence\AppData\Local\Android\android-sdk\platform-tools>adb shell
shell@android:/ $ su
su
root@android:/ # mount -o remount,rw /system
mount -o remount,rw /system
root@android:/ # exit
exit
shell@android:/ $ exit
exit

C:\Users\Terrence\AppData\Local\Android\android-sdk\platform-tools>adb push C:\U
sers\Terrence\deodexed_apps /system/app/
push: C:\Users\Terrence\deodexed_apps/YahoostockWidget.apk -> /system/app/Yahoos
tockWidget.apk
failed to copy 'C:\Users\Terrence\deodexed_apps/YahoostockWidget.apk' to '/syste
m/app/YahoostockWidget.apk': Permission denied

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Phone is rooted according to RootChecker. No Knox or anything else like that. Android 4.1.

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