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U7 = a + 6b = 37
-------------------- -
-3b = -18 <-> b = 6
subtitusi b=6
a + 3(6) = 19
a = 19 - 18 = 1
S24 = (24/2) (2.1 + 23.6)
= 12 ( 2 + 138)
= 12 (140)
= 1680