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-y - 5 = 9x - 18
9x + y - 13 = 0 (Nomor 20)
(Nomor 11) sebelah kanan & kiri bagian paling atas (nggak keliatan fotonya)
(Nomor 7) D
(Nomor 8) D
(Nomor 22) Un = n^2 + 3