start-emulator or start-device fails for missing "dx.jar"

If you try to "start-emulator" or "start-device", but fails on dx error, and if you found "cannot find dx.jar", you can fix it by putting symbolic like

ln -s $ANDROID_SDK_HOME/platform-tools $ANDROID_SDK_HOME/platforms/android-7/platform-tools

It seems this happens when using old android-7 project with new SDKs like r14.

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