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Simplifying 5a + 15 = 45 + 3a Reorder the terms: 15 + 5a = 45 + 3a Solving 15 + 5a = 45 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 15 + 5a + -3a = 45 + 3a + -3a Combine like terms: 5a + -3a = 2a 15 + 2a = 45 + 3a + -3a Combine like terms: 3a + -3a = 0 15 + 2a = 45 + 0 15 + 2a = 45 Add '-15' to each side of the equation. 15 + -15 + 2a = 45 + -15 Combine like terms: 15 + -15 = 0 0 + 2a = 45 + -15 2a = 45 + -15 Combine like terms: 45 + -15 = 30 2a = 30 Divide each side by '2'. a = 15 Simplifying a = 15
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