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Simplifying 9 = -2(a + 4) + 9 Reorder the terms: 9 = -2(4 + a) + 9 9 = (4 * -2 + a * -2) + 9 9 = (-8 + -2a) + 9 Reorder the terms: 9 = -8 + 9 + -2a Combine like terms: -8 + 9 = 1 9 = 1 + -2a Solving 9 = 1 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 9 + 2a = 1 + -2a + 2a Combine like terms: -2a + 2a = 0 9 + 2a = 1 + 0 9 + 2a = 1 Add '-9' to each side of the equation. 9 + -9 + 2a = 1 + -9 Combine like terms: 9 + -9 = 0 0 + 2a = 1 + -9 2a = 1 + -9 Combine like terms: 1 + -9 = -8 2a = -8 Divide each side by '2'. a = -4 Simplifying a = -4
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