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Simplifying 2a + 4 + 9 = 0 Reorder the terms: 4 + 9 + 2a = 0 Combine like terms: 4 + 9 = 13 13 + 2a = 0 Solving 13 + 2a = 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 + 2a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 2a = 0 + -13 2a = 0 + -13 Combine like terms: 0 + -13 = -13 2a = -13 Divide each side by '2'. a = -6.5 Simplifying a = -6.5
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