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Simplifying a + (7 + 6) = (a + 7) + 6 Combine like terms: 7 + 6 = 13 a + (13) = (a + 7) + 6 a + 13 = (a + 7) + 6 Reorder the terms: 13 + a = (a + 7) + 6 Reorder the terms: 13 + a = (7 + a) + 6 Remove parenthesis around (7 + a) 13 + a = 7 + a + 6 Reorder the terms: 13 + a = 7 + 6 + a Combine like terms: 7 + 6 = 13 13 + a = 13 + a Add '-13' to each side of the equation. 13 + -13 + a = 13 + -13 + a Combine like terms: 13 + -13 = 0 0 + a = 13 + -13 + a a = 13 + -13 + a Combine like terms: 13 + -13 = 0 a = 0 + a a = a Add '-1a' to each side of the equation. a + -1a = a + -1a Combine like terms: a + -1a = 0 0 = a + -1a Combine like terms: a + -1a = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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