To solve for the missing exponent in the equation \( h450h? = h215 \), we can assume that the exponents in each term indicate some kind of operation that relates to the base \( h \).
Since the base \( h \) is common, we can equate the exponents, leading us to the equation:
\[ 450 + ? = 215 \]
To isolate \( ? \), we rearrange it:
\[ ? = 215 - 450 \]
Calculating the right side:
\[ ? = -235 \]
Thus, the missing exponent is:
\[ \boxed{-235} \]
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