Look back at the expressions in problem 2-150 that are not equivalent. Are there any values of the variables that would make them equal? Justify your reasoning.
For parts (d) and (f) try setting the expressions or equations equal to each other, then simplify, and explain the meaning of the results.
In part (d), the values
In part (e), x ≠ 0 because it is not in the denominator.