Here's your answer, folks:
Without substitution, yes, here? No.
The value of the substituted numbers is essential to finding the correct answer in algebra.
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5 x 3 = 15
15 squared or cubed = 15 x 15 || 15 x 15 x 15
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In that case, 15 times a number could not possibly be equal to 5 x 3 unless x was actually 1, which we do not know.