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670= 1/2 20 (5+n)
670=10 (5+n)
670 = 50 + 10n
670-50 = 10n
620 = 10n
n = 620/10
n= 62
Jawaban q kayak gini, maaf lo salah..
670= 1/2 20 (5+n)
670=10 (5+n)
670 = 50 + 10n
670-50 = 10n
620 = 10n
n = 620/10
n= 62
maaf klo salah