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