HELP ASAP pleas Solve for x, 3y = z - 2x

please also explain the steps you did to get the answer. it doesn't have to be a long explanation. just enough so I understand

The purpose of a preliminary hearing in juvenile court isa-to determine if there is a probable cause to proceed with trialb-to determine if the juvenile will be a detailed pending trialc- to appoint counsel for the juvenile defendant d-to impose sentencing