Row and column traversal script

I am making a script for the google spreadsheet that goes through the rows and columns in search of specific values ​​and counts them for me, to later write it in another sheet.

This is the script I have right now:

function myFunction() {

  var ss = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Calvià");
  var lastrow = ss.getLastRow();
  var nombres = 2;
  var parque = 2;
  var posiciong = 2;
  var posiciongr = 2;


  for (r=7; r<lastrow+1; r++){

      var G = 0;
      var GR = 0;
      var range = ss.getRange(r,1).getValue();

      if (range!=0){

        var range2 = ss.getRange(r,4).getValue();
        SpreadsheetApp.getActiveSpreadsheet().getSheetByName("ContadorHoras").getRange(nombres, 1).setValue(range);
        SpreadsheetApp.getActiveSpreadsheet().getSheetByName("ContadorHoras").getRange(parque, 2).setValue(range2);
        nombres = nombres + 1;
        parque = parque +1;

        for (c=6; c<93; c++){

          var rangec = ss.getRange(r,c).getValue().toString;

          if (rangec="G"){

            G = G + 1;

          }if (rangec="GR"){

            GR = GR + 1;

          }

        }

        SpreadsheetApp.getActiveSpreadsheet().getSheetByName("ContadorHoras").getRange(posiciong, 3).setValue(G);
        SpreadsheetApp.getActiveSpreadsheet().getSheetByName("ContadorHoras").getRange(posiciongr, 4).setValue(GR);
        posiciong = posiciong + 1;
        posiciongr = posiciongr + 1;

      }

  }

}

Everything works fine until I add the second for, with the first for, I go through the rows and with the second, the columns of each row looking for some values ​​and counting them, my problem is that I can't get this second for to work well, everything the time tells me that GY GR is 87.