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Simplifying a + -1 = a + -12 Reorder the terms: -1 + a = a + -12 Reorder the terms: -1 + a = -12 + a Add '-1a' to each side of the equation. -1 + a + -1a = -12 + a + -1a Combine like terms: a + -1a = 0 -1 + 0 = -12 + a + -1a -1 = -12 + a + -1a Combine like terms: a + -1a = 0 -1 = -12 + 0 -1 = -12 Solving -1 = -12 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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