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7 and 3 - 2x are factors of 21 - 14x
X = 7 9x - 2x = 49
2x + 7
The constant. For instance, if you had 2x +5, +5 would be your constant, because no matter what number you substitute in for x, the last term of the expression will be +5. It is independent of the x and y value.
The given expression can be simplified to: 2x-2