Firstly add sdk path address on System Variable.
after open CMD with administrator. then
cd %appdata%/../local/android/sdk/tools
after then
emulator -list-avds
**result: **
1) Example bla bla emulator 2) Example bla bla emulator 3) Example bla bla emulator 4) Example bla bla emulator
then
emulator -avd "your emulator name"
**example: **emulator -avd Nexus_5X_PLUS_API
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