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Simplifying (a + b) + (a + -1b) = 2a Remove parenthesis around (a + b) a + b + (a + -1b) = 2a Remove parenthesis around (a + -1b) a + b + a + -1b = 2a Reorder the terms: a + a + b + -1b = 2a Combine like terms: a + a = 2a 2a + b + -1b = 2a Combine like terms: b + -1b = 0 2a + 0 = 2a 2a = 2a Add '-2a' to each side of the equation. 2a + -2a = 2a + -2a Combine like terms: 2a + -2a = 0 0 = 2a + -2a Combine like terms: 2a + -2a = 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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