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5 + 23 = 28
(-15) + 23 = 8
5 + 23 = 28 11 + 17 = 28
It is an algebraic expression which equals a + 28.
23 = 7x + 7x - 5 = 14x - 5 14x = 23 + 5 = 28 x = 28/14 = 2