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BE.....BD
----- =------
BC.....AB
x....................7
----------- =------------
(4 + x).......( 7 + 5)
x ( 12) = 7 ( 4 + x)
12x = 28 + 7x
12x - 7x = 28
5x = 28
x = 5,6 cm
maka nilai x = 5,6 cm
yg nomor 35 jawabannya A