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Use deductive reasoning to tell whether each statement is true or false. If it is false, give a counterexample. 22. For all real numbers a and b, a - b = -b + a. 23. For all real numbers p, q and r, p - 4-r=p-r-q. 24. For all real numbers x, y and z, (x + y) + z = z + (x + y). 25. For all real numbers m and n, m. n = n. m.
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