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Simplifying (a + 18) + -1(a + 9) = 0 Reorder the terms: (18 + a) + -1(a + 9) = 0 Remove parenthesis around (18 + a) 18 + a + -1(a + 9) = 0 Reorder the terms: 18 + a + -1(9 + a) = 0 18 + a + (9 * -1 + a * -1) = 0 18 + a + (-9 + -1a) = 0 Reorder the terms: 18 + -9 + a + -1a = 0 Combine like terms: 18 + -9 = 9 9 + a + -1a = 0 Combine like terms: a + -1a = 0 9 + 0 = 0 9 = 0 Solving 9 = 0 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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