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10+10 = 20
B+C
10+10 = 20
C+D
10+10 = 20
Jadi A-D
10-10 = 0
B=10+C
C=10+D
Dit= selisih A & D
Dij=A=10+(10+10)=10+20=30
D=30-20=10
maaf kk klo salah