BEGIN{
  FS=OFS="="
}
{
  num=split($2,array1,",")
  for(i=1;i<=num;i++){
    num1=split(array1[i],array2,"+")
      for(k=1;k<=num1;k++){
        if(num1==1){array1[i]=array2[k] }
        if(array2[k]~/^[0-9]+$/){
           val+=array2[k]
           array1[i]=(array2[1]!=""?"":"+") val (array2[num1]!=""?"":"+")
        }
     }
     val=""
  }
  for(o=1;o<=num;o++){
    value=(value?value ",":"")array1[o]
  }
  $2=value
  value=""
}
1