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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
b = (U7 - U3)/(7 - 3)
b = (26 - 120)/4
b = -94/4
b = -23,5
U21 = U7 + 14b
U21 = 26 + 14 . (-23,5)
U21 = 26 - 329
U21 = -303