Simplify the following expressions with monomials

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

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