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2x-4-\left(-x\right)
To find the opposite of 4-x, find the opposite of each term.
2x-4+x
The opposite of -x is x.
3x-4
Combine 2x and x to get 3x.
2x-4-\left(-x\right)
To find the opposite of 4-x, find the opposite of each term.
2x-4+x
The opposite of -x is x.
3x-4
Combine 2x and x to get 3x.