(Appendix A.3) Three equations follow. One is an identity, another is a contradiction, and a third has a solution. State which is which.
2(x − 5) + 13 − 1 = 9 − 7 + 2x
2(x − 4) + 13 − 1 = 9 + 7 − 2x
2(x − 5) + 13 − 1 = 9 + 7 + 2x
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