code: public static LongBinding multiplyExact(final long x, final ObservableLongValue y) {
          return createLongBinding(() -> Math.multiplyExact(x, y.get()), y);
      }
docs: Binding for {@link java.lang.Math#multiplyExact(long, long)}
  
  @param x the first value
  @param y the second value
  @return the result
  @throws ArithmeticException if the result overflows a long