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Simplifying -2a + 5a + 9 = 0 Reorder the terms: 9 + -2a + 5a = 0 Combine like terms: -2a + 5a = 3a 9 + 3a = 0 Solving 9 + 3a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 3a = 0 + -9 3a = 0 + -9 Combine like terms: 0 + -9 = -9 3a = -9 Divide each side by '3'. a = -3 Simplifying a = -3
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