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maka a=34
18+21+24+34+36+37+b/7 = 35
170+b = 35 x 7
170 + b = 245
b = 245-170
b=75
selisihnya = 75-34 = 39
rata-rata =
35 =
7 x 35 = 170 + b
245 = 170 + b
b = 245 - 170
b = 75