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Jadi:
5a+7:3=19
5a+7=19 x 3
5a=57-7
5a=50
a=50/5
a=10
Anggap saja angka tersebut adalah X,
maka:
(5X + 7): 3 = 19
5X + 7 = 19 x 3
5X + 7 = 57
5X = 57 - 7
5X = 50
X = 50/5
X = 10
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