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    x/x = 1         ( x != 0 )
0/x = 0         ( x != 0 )
x/y = x * (1/y) ( y != 0 )
  2. or download this
    (1)              a = b            ( a != 0, b != 0 )
(2)             aa = ab
...
(7)             2b = b
(8)              2 = b/b
(9)              2 = 1
  3. or download this
    (5)   ( ( a - b ) / ( a - b ) )( a + b ) =  ( ( a - b ) / ( a - b ) )b