how to parse command value in powershell

C++
powershell -Command "(gc $env:userprofile\.android\avd\Nexus_4_API_23.avd\config.ini) -replace 'vm.heapSize=%getRam%','%setRam%' | Out-File -encoding ASCII $env:userprofile\.android\avd\Nexus_4_API_23.avd\config.ini"
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