3*0 = 0
Dividing both sides by 3 gives 0 = 0/3
and therefore 0/3 is defined and is equal to 0.
However, there is no number, k, such that k*0 = 3 and so division by 0 is not defined.
If there were such a number k, then you could divide both sides by k to give 0 = 3/k. But there is no such k.
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Undefined: You cannot divide by zero
The operation, division, is not symmetric. There is a number, x, such that x*3 = 0. In fact x is also 0. But there is no number, y, such that y*0 = 3.
x = -5/3
8/8 - 1 + 3 - 1 + 0 = 1-1+3-1+0 = 0 + 3 - 1 + 0 = 3 - 1 = 2
9.3333