One of the most enjoyable things in the world can be a simple proof.
Now, how would we go about doing this exactly?
0=-1(0). This reads zero is equal to negative one times zero. In other words, on the right hand side we have no negative 1s.
0=-1(1-1). 1 minus 1 has the same value as zero.
Third, use distribution.
0=-1+(-1)(-1). One times a negative one is a negative value. Another way of putting this is that we have 1 negative 1 value.
Fourth, add one on both sides of the equation.
Fifth, since -1+1 is equal to zero, we have
Sixth, because 0+a=a, we now have