udef = ud3.clone().divideBy(ud4).simplify();
printTask('/', ud3, ud4, udef);
assertTrue(UnitDefinition.printUnits(udef, true).equals("60*dimensionless"));
UnitDefinition u1 = new UnitDefinition(level, version);
u1.addUnit(new Unit(-3, Unit.Kind.JOULE, level, version));
u1.addUnit(new Unit(-3, Unit.Kind.MOLE, level, version));
UnitDefinition u2 = new UnitDefinition(level, version);
u2.addUnit(new Unit(Unit.Kind.JOULE, 5, level, version));
u2.addUnit(new Unit(Unit.Kind.MOLE, 5, level, version));