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Simplifying 9(a + 1) + -2(a + -2) = 0 Reorder the terms: 9(1 + a) + -2(a + -2) = 0 (1 * 9 + a * 9) + -2(a + -2) = 0 (9 + 9a) + -2(a + -2) = 0 Reorder the terms: 9 + 9a + -2(-2 + a) = 0 9 + 9a + (-2 * -2 + a * -2) = 0 9 + 9a + (4 + -2a) = 0 Reorder the terms: 9 + 4 + 9a + -2a = 0 Combine like terms: 9 + 4 = 13 13 + 9a + -2a = 0 Combine like terms: 9a + -2a = 7a 13 + 7a = 0 Solving 13 + 7a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 7a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 7a = 0 + -13 7a = 0 + -13 Combine like terms: 0 + -13 = -13 7a = -13 Divide each side by '7'. a = -1.857142857 Simplifying a = -1.857142857
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