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u3 + u4 = 12
maaf tidak beserta cara. soalnya panjang sekali
=
-33 =
-33 =
-33 = 11a
a = -3
= -3 . () + (-3) .()
= -3 . 4 + (-3) . -8
= -12 + 24
=12
jd jwbnnya C 12.