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Simplifying (2a + -4) + (5a + 9) = 0 Reorder the terms: (-4 + 2a) + (5a + 9) = 0 Remove parenthesis around (-4 + 2a) -4 + 2a + (5a + 9) = 0 Reorder the terms: -4 + 2a + (9 + 5a) = 0 Remove parenthesis around (9 + 5a) -4 + 2a + 9 + 5a = 0 Reorder the terms: -4 + 9 + 2a + 5a = 0 Combine like terms: -4 + 9 = 5 5 + 2a + 5a = 0 Combine like terms: 2a + 5a = 7a 5 + 7a = 0 Solving 5 + 7a = 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 + 7a = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 7a = 0 + -5 7a = 0 + -5 Combine like terms: 0 + -5 = -5 7a = -5 Divide each side by '7'. a = -0.7142857143 Simplifying a = -0.7142857143
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