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=36^2-7ab-3b^2 : (3a+b)
=36^2-7ab-9b^2 : (3a+b)
=(36a-7a)+(7b-9b) : (3a+b)
=(29a - 2b) : (3a+b)
=(29a x3a) - (2b x b)
=87a^2 - 2b^2
semoga jawabannya dapat membantu dan mohon maaf jika ada yg salah