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Simplifying 3a + 7 + 2(3 + a) = 0 3a + 7 + (3 * 2 + a * 2) = 0 3a + 7 + (6 + 2a) = 0 Reorder the terms: 7 + 6 + 3a + 2a = 0 Combine like terms: 7 + 6 = 13 13 + 3a + 2a = 0 Combine like terms: 3a + 2a = 5a 13 + 5a = 0 Solving 13 + 5a = 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 + 5a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 5a = 0 + -13 5a = 0 + -13 Combine like terms: 0 + -13 = -13 5a = -13 Divide each side by '5'. a = -2.6 Simplifying a = -2.6
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