x + x + (-x)
=
x
- x + (x - x)
=
x
2x + 2x - (x - x)
=
x
(-2)·x·(-3)
=
x
2·(-x)·(-3)
=
x
x·( 2·3 )
=
x
-x·( 2·3 )
=
x
( 5x )3
=
x
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