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6x = 30
x = 5
5d - 11 = 4d
d = 11
a + a + 2 + a + 4 = 78
3a + 6 = 78
3a = 72
a = 24
bilangan terbesar = 24 + 4 = 28
6x = 30
x = 5
_________________
5d - 11 = 4d
d = 11
_________________
a + a + 2 + a + 4 = 78
3a + 6 = 78
3a = 72
a = 24
Bilangan terbesar :
24 + 4 = 28