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a + a + 2 = 40
a) bilangan kedua adalah a+2
b) a + a + 2 = 40
2a + 2 = 40
2a + 2 - 2 = 40 - 2
2a = 38
a = 38/2 = 19
c) bilangan pertama = a = 19
bilangan kedua = a + 2 = 19 + 2 = 21