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Simplifying 3a + 7 + 2(3 + 9) = 0 Combine like terms: 3 + 9 = 12 3a + 7 + 2(12) = 0 Multiply 2 * 12 3a + 7 + 24 = 0 Reorder the terms: 7 + 24 + 3a = 0 Combine like terms: 7 + 24 = 31 31 + 3a = 0 Solving 31 + 3a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-31' to each side of the equation. 31 + -31 + 3a = 0 + -31 Combine like terms: 31 + -31 = 0 0 + 3a = 0 + -31 3a = 0 + -31 Combine like terms: 0 + -31 = -31 3a = -31 Divide each side by '3'. a = -10.33333333 Simplifying a = -10.33333333
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