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U13: a+12b= 35
a+4b=11
a+12b=35
(dikurangi)
-8b=-24
b=-24/-8
b= 3
a+4b= 11
a+4*3=11
a+12=11
a=11-12
a=-1
u9= a+(n-1)b
u9= -1+(9-1)3
u9=-1+24
u9=23