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a+4b=15
U9+U23=96
a+8b+a+22b=96
2a+30b=96 di bagi 2
a+15b = 48 sama aja U16 atau suku ke 16
eleminasikan
a+4b=15
a+15b=48
kurangkan
-11b=-33
b=3
a+4(3)=15
a=15-12
a=3
U10=a+(10-1)b
=3+9(3)
=3+27
=30