Brihatparasharahorashastra 78.10

78.10

dvābhyāmeko'dhiko yaśca tasyādhikyaṃ nigadyate
anyathā guṇasāmyaṃ ca vijñeyaṃ dvijasattama

Whichever one [guṇa] is greater than the other two, its predominance is declared; / otherwise, an equilibrium of guṇas should be known, O best of the twice-born.