Cannot find AVD system path for Emulator in Android studio?

[pmam]

I am trying to run AVD emulator of Android studio and get this error:

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Emulator: PANIC: Cannot find AVD system path. Please define ANDROID_SDK_ROOT

I read this wiki: https://wiki.gentoo.org/wiki/Handbook:X ... ing/EnvVar
and found in this file: /etc/env.d/80android-sdk-update-manager

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PATH="/opt/android-sdk-update-manager/tools:/opt/android-sdk-update-manager/platform-tools"
ANDROID_SWT="//usr/share/swt-3.7/lib"
ANDROID_HOME="/opt/android-sdk-update-manager"

I have Android in this PATH: /home/user/Android/Sdk
Please advise what need to do (maybe with export command) in order to fix it?

[pmam]

I also followed this wiki: https://wiki.gentoo.org/wiki/Android_studio ,
however still can not launch emulator and get same error while trying form console:

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~/Android/Sdk/tools $ ./emulator -avd Nexus_5X_API_19
PANIC: Cannot find AVD system path. Please define ANDROID_SDK_ROOT

It is true that emulator is slower and better to run app on device,
however sometimes need to run app on other devices...
Please advise!