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Are the following algebraic expressions equivalent? (b + 2) − (b − 5) and (b + 2) − b + 5
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To decide, Tom replaces $b$ with $8$ in the expressions:

$(b + 2) − (b − 5)$

$= (8 + 2) − (8 − 5)$

$= 10 − 3$

$=7$

and

$(b + 2) − b + 5$

$= (8 + 2) − 8 + 5$

$= 10 − 8 + 5$

$= 7$

Steph says to Tom that she can show that the two expressions are equivalent without replacing $b$ with numbers.
by Diamond (54,776 points)