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a=3
d=3
jadi a+d=6
b + c = 3 -> c = 3 - b
c + d = 4 -> d = 4 - c
d = 4 - (3 - b)
d = 4 - 3 + b
d = 1 + b
maka,
a + d = (5 - b) + (1 + b)
a + d = 5 - b + 1 + b
a + d = 6 - b + b
a + d = 6
semoga bermanfaat,,
jangan lupa bintangnya,,