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Simplifying -1(a + 1) = 7 + -1a Reorder the terms: -1(1 + a) = 7 + -1a (1 * -1 + a * -1) = 7 + -1a (-1 + -1a) = 7 + -1a Add 'a' to each side of the equation. -1 + -1a + a = 7 + -1a + a Combine like terms: -1a + a = 0 -1 + 0 = 7 + -1a + a -1 = 7 + -1a + a Combine like terms: -1a + a = 0 -1 = 7 + 0 -1 = 7 Solving -1 = 7 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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