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Simplifying 9a + 3 = 7a + 15 Reorder the terms: 3 + 9a = 7a + 15 Reorder the terms: 3 + 9a = 15 + 7a Solving 3 + 9a = 15 + 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. 3 + 9a + -7a = 15 + 7a + -7a Combine like terms: 9a + -7a = 2a 3 + 2a = 15 + 7a + -7a Combine like terms: 7a + -7a = 0 3 + 2a = 15 + 0 3 + 2a = 15 Add '-3' to each side of the equation. 3 + -3 + 2a = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 2a = 15 + -3 2a = 15 + -3 Combine like terms: 15 + -3 = 12 2a = 12 Divide each side by '2'. a = 6 Simplifying a = 6
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