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Just to try to make it a bit clearer (???):
Itīs true that
6 x 3 = 3 x 6
If you divide both sides by 6 or 3, the equation remains true
Now,
10 x 0 = 20 x 0
If you divide both sides by any number, except zero, equalty remains
However, if you divide by zero, you get 10 = 20 (absurd)
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