Android O, failed to mount/system,/dev/block/dm-0 is read only

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from:https://android.stackexchange.com/questions/186630/android-o-failed-to-mount-system-dev-block-dm-0-is-read-only
I try to mount/system in Android O to RW using the command  mount -o rw,remount /system , and i got this feedback on terminal  dev/block/dm-0 is read-only  *Already in adb root
Any idea? Thanks
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For debug build, user have to  disable-verity  at first.
adb root
adb disable-verity
adb reboot
adb remount
adb shell
mount -o rw,remount /system

In order to know build type of your android, in  adb shell  enter the following command
cat /system/build.prop | grep build.type