How about this one then:
The square root of 25 (sqrt(25)) is +/- 5
So,
sqrt(25) = sqrt(25)
5 = -5
10 = 0 (adding 5 to both sides)
1 = 0 (dividing both sizes by 10)
We know that for all numbers A, A*1 = A
Also, we know that for all numbers A, A*0 = 0
So, if we multiply both sides of that last equation by A, we get:
A = 0
Thus proving that all numbers equal zero.
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