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U5 ⇒ a + 4b = 8 eliminasi
4b = 12
b = 3
subtitusikan
a + 4b = 8
a + 4(3)=8
a + 12 = 8
a = 8 -12
a = -4
Un = a + (n-1)b
U10 = -4 + (10-1)3
= -4 + 27
= 23
jawabannya 23