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Simplifying 9a + 15 = 7a + 9 Reorder the terms: 15 + 9a = 7a + 9 Reorder the terms: 15 + 9a = 9 + 7a Solving 15 + 9a = 9 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 15 + 9a + -7a = 9 + 7a + -7a Combine like terms: 9a + -7a = 2a 15 + 2a = 9 + 7a + -7a Combine like terms: 7a + -7a = 0 15 + 2a = 9 + 0 15 + 2a = 9 Add '-15' to each side of the equation. 15 + -15 + 2a = 9 + -15 Combine like terms: 15 + -15 = 0 0 + 2a = 9 + -15 2a = 9 + -15 Combine like terms: 9 + -15 = -6 2a = -6 Divide each side by '2'. a = -3 Simplifying a = -3
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