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Simplifying -2a + -1a + 9 = 3a + -9 Reorder the terms: 9 + -2a + -1a = 3a + -9 Combine like terms: -2a + -1a = -3a 9 + -3a = 3a + -9 Reorder the terms: 9 + -3a = -9 + 3a Solving 9 + -3a = -9 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 9 + -3a + -3a = -9 + 3a + -3a Combine like terms: -3a + -3a = -6a 9 + -6a = -9 + 3a + -3a Combine like terms: 3a + -3a = 0 9 + -6a = -9 + 0 9 + -6a = -9 Add '-9' to each side of the equation. 9 + -9 + -6a = -9 + -9 Combine like terms: 9 + -9 = 0 0 + -6a = -9 + -9 -6a = -9 + -9 Combine like terms: -9 + -9 = -18 -6a = -18 Divide each side by '-6'. a = 3 Simplifying a = 3
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