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Let r be the length of Route 32.
Since Highway 199 is 7.2 miles longer than Route 32, we can write the equation:
85.3 = r + 7.2
To find the length of Route 32, we need to solve for r:
r + 7.2 = 85.3
r = 85.3 - 7.2
r = 78.1
Therefore, the length of Route 32 is 78.1 miles.