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anggap
DE = x
AE=(15-x)
(15-x)/12 = x/6
12x = 90-6x
90 = 18x
x=5
AE = 15-x = 15-5 = 10
de=15-ae maka:
2(15-ae)=ae
30-2ae=ae
30=2ae+ae=3ae
30/3=ae
ae=10
good luck