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Simplifying -1(a + -1b) = (-1)(a + -1b) (a * -1 + -1b * -1) = (-1)(a + -1b) (-1a + 1b) = (-1)(a + -1b) -1a + 1b = (a * -1 + -1b * -1) -1a + 1b = (-1a + 1b) Add 'a' to each side of the equation. -1a + a + 1b = -1a + a + 1b Combine like terms: -1a + a = 0 0 + 1b = -1a + a + 1b 1b = -1a + a + 1b Combine like terms: -1a + a = 0 1b = 0 + 1b 1b = 1b Add '-1b' to each side of the equation. 1b + -1b = 1b + -1b Combine like terms: 1b + -1b = 0 0 = 1b + -1b Combine like terms: 1b + -1b = 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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