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7a+7b/21 = 6a/21 (hilangkan penyebut karna sama)
7a+7b = 6a
7b = 6a -7a
7b = -a
jadi selisihnya 7b-a
Likenya + jawaban terbaik :) makasi
=(7a+7b/21) - (4a/21)
= 3a+7b/21