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(4+3 9+(-1) 2+4 6+2 )= (7a 2b 3c 4d)
( 7 8 6 8)= (7a 2b 3c 4d)
i. 7=7a
a=1
ii. 8=2b
b=4
iii. 6=3c
c=2
iv. 8=4d
d=2
nilai a+b+c+d= 1+4+2+2 =9
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