| ( | x | − | 7 | ) | ÷ | 2010 | + | ( | x | − | 6 | ) | ÷ | 2011 | + | ( | x | − | 5 | ) | ÷ | 2012 | − | ( | x | − | 4 | ) | ÷ | 2013 | = | 1 |
| Left side of the equation = | x | × | 1 2010 | − | 7 | × | 1 2010 | + | ( | x | − | 6 | ) | × | 1 2011 | + | ( | x | − | 5 | ) | × | 1 2012 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | x | × | 1 2010 | − | 7 2010 | + | ( | x | − | 6 | ) | × | 1 2011 | + | ( | x | − | 5 | ) | × | 1 2012 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | 1 2010 | x | − | 7 2010 | + | x | × | 1 2011 | − | 6 | × | 1 2011 | + | ( | x | − | 5 | ) | × | 1 2012 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | 1 2010 | x | − | 7 2010 | + | x | × | 1 2011 | − | 6 2011 | + | ( | x | − | 5 | ) | × | 1 2012 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | 4021 4042110 | x | − | 26137 4042110 | + | ( | x | − | 5 | ) | × | 1 2012 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | 4021 4042110 | x | − | 26137 4042110 | + | x | × | 1 2012 | − | 5 | × | 1 2012 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | 4021 4042110 | x | − | 26137 4042110 | + | x | × | 1 2012 | − | 5 2012 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | 6066181 4066362660 | x | − | 36399097 4066362660 | − | ( | x | − | 4 | ) | × | 1 2013 |
| = | 6066181 4066362660 | x | − | 36399097 4066362660 | − | x | × | 1 2013 | + | 4 | × | 1 2013 |
| = | 6066181 4066362660 | x | − | 36399097 4066362660 | − | x | × | 1 2013 | + | 4 2013 |