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a + (a + 2) + (a + 2 + 2) = 42
a + a + 2 + a + 4 = 42
3a + 6 = 42
3a = 42 - 6
3a = 36
a = 12
a + 4 = 12 + 4 = 16 +
= 28
12 + 16 = 28