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Simplifying 2a + 9 = 3 + -1a Reorder the terms: 9 + 2a = 3 + -1a Solving 9 + 2a = 3 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 9 + 2a + a = 3 + -1a + a Combine like terms: 2a + a = 3a 9 + 3a = 3 + -1a + a Combine like terms: -1a + a = 0 9 + 3a = 3 + 0 9 + 3a = 3 Add '-9' to each side of the equation. 9 + -9 + 3a = 3 + -9 Combine like terms: 9 + -9 = 0 0 + 3a = 3 + -9 3a = 3 + -9 Combine like terms: 3 + -9 = -6 3a = -6 Divide each side by '3'. a = -2 Simplifying a = -2
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