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Simplifying (a + (-1b)) + (b + (-1a)) = 0 Remove parenthesis around (a + (-1b)) a + (-1b) + (b + (-1a)) = 0 Reorder the terms: a + (-1b) + ((-1a) + b) = 0 Remove parenthesis around ((-1a) + b) a + (-1b) + (-1a) + b = 0 Reorder the terms: a + (-1a) + (-1b) + b = 0 Combine like terms: a + (-1a) = 0 0 + (-1b) + b = 0 (-1b) + b = 0 Combine like terms: (-1b) + b = 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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