Simplify the following expressions with monomials
x + x + x
=
x
x + x - x
=
x
x + x - x - x
=
x
- x + (x - x)
=
x
x + 2x + 3x
=
x
2x + 2x - x - x
=
x
2x + 2x - (x - x)
=
x
2x - 5x
=
x
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