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Let's say Cassandra's younger brother's height is x inches.
Then three times her younger brother's height would be 3x inches.
And 6 inches less than three times her younger brother's height would be 3x - 6 inches.
Cassandra's height is 63 inches, so we can set up the equation:
3x - 6 = 63.
This equation represents the problem using the form px + q = r.