fortina.sh

a=
b=
c=
d=
fix=0

declare -a SEQ=( {0..130} )

for a in ${SEQ[@]}; do
  for b in ${SEQ[@]}; do
    for c in ${SEQ[@]}; do
      for d in ${SEQ[@]}; do

      echo -ne "                                         \r"
      echo -ne "A:$a B:$b C:$c D:$d \t"
      
      [ $(( a + b )) -eq 80 ]   && echo -n . || continue
      [ $(( a + c )) -eq 130 ]  && echo -n . || continue
      [ $(( c - d )) -eq 60 ]   && echo -n . || continue
      [ $(( b + d )) -eq 80 ]   && echo -n . || continue

      fix=1

      break

      done
      ((fix)) && break
    done
    ((fix)) && break
  done
  ((fix)) && break
done

((fix)) && echo -e "Done\n" && echo -e "A:$a B:$b C:$c D:$d\n" || echo "NOPE"