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Simplifying 7a + 5 + -1[3 + -1(2a + 3)] = 0 Reorder the terms: 7a + 5 + -1[3 + -1(3 + 2a)] = 0 7a + 5 + -1[3 + (3 * -1 + 2a * -1)] = 0 7a + 5 + -1[3 + (-3 + -2a)] = 0 Combine like terms: 3 + -3 = 0 7a + 5 + -1[0 + -2a] = 0 7a + 5 + -1[-2a] = 0 Remove brackets around [-2a] 7a + 5 + -1 * -2a = 0 Multiply -1 * -2 7a + 5 + 2a = 0 Reorder the terms: 5 + 7a + 2a = 0 Combine like terms: 7a + 2a = 9a 5 + 9a = 0 Solving 5 + 9a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 9a = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 9a = 0 + -5 9a = 0 + -5 Combine like terms: 0 + -5 = -5 9a = -5 Divide each side by '9'. a = -0.5555555556 Simplifying a = -0.5555555556
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