!7

sS text = [[
  i started 5 years ago
  current year is 2019
  2019-5 = 2014
  i started in 2014
]];

p-exp {
  S text, SS map = unpair replaceNumbersWithABCDollarVars(main.text);
  map = reverseMap(map);
  print(text);
  printStruct(map);
  new Matches m;
  for (S s : tlft(text))
    if (jmatch("*-* = *", s, m)) pcall {
      print(s);
      S a = getOrKeep(map, $1), b = getOrKeep(map, $2), c = getOrKeep(map, $3);
      print(a + " - " + b + " = " + c);
      if (eq(minus(bigint(a), bigint(b)), bigint(c))) {
        print("  correct!");
        print("  so: " + $3 + " = " + $1 + " - " + $2);
      }
    }
}