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u11=a+ 10b = -13
-8b = 24
b = -3
a + 2b = 11
a +2 (-3) = 11
a + (-6) = 11
a = 11 + 6 = 17
jadi, u7 = a +( n-1) . b
17 + (7-1) . -3
17 + (-18)
17 - 18 = -1 (D)