2011 Feb 8 11:43 PM UTC | Math7 [2011]8
Try to solve this equation:
$$2a - a = a^2 - a^2 + a-2$$
Let’s simplify it first:
Remove duplicates:
$$2a - a = a - 2$$
Reduce like terms by cancelling:
$$a = a - 2$$
And it cannot be solved xD