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6,6= 20+66+7n+40+18 dibagi 22+n
6,6=144 +7n dibagi 22+n
6,6 (22+n) = 144 + 7n
145,2+6,6n = 144 + 7n
145,2 - 144 = 7n - 6,6n
1,2 = 0,4n
1,2 / 0,4 = n
3 = n
jadi jawabannya D.3