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a+4b=21
a = 4
4 + 9b = 41
37 : 9
kemudian di cari S50 nyaa semoga membantu
U5 = a+4b = 21 (dieliminasi)
=> 5b = 20
=> b = 4
a+4b = 21
a+4(4) = 21
a+16 = 21
a = 15
U50 = a+49b
= 15 + 49(4)
= 211