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Simplifying 3a + 4(2a + 5) = 9 Reorder the terms: 3a + 4(5 + 2a) = 9 3a + (5 * 4 + 2a * 4) = 9 3a + (20 + 8a) = 9 Reorder the terms: 20 + 3a + 8a = 9 Combine like terms: 3a + 8a = 11a 20 + 11a = 9 Solving 20 + 11a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 11a = 9 + -20 Combine like terms: 20 + -20 = 0 0 + 11a = 9 + -20 11a = 9 + -20 Combine like terms: 9 + -20 = -11 11a = -11 Divide each side by '11'. a = -1 Simplifying a = -1
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