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Simplifying 13a + 1 + -9a = 2a + 15 Reorder the terms: 1 + 13a + -9a = 2a + 15 Combine like terms: 13a + -9a = 4a 1 + 4a = 2a + 15 Reorder the terms: 1 + 4a = 15 + 2a Solving 1 + 4a = 15 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 1 + 4a + -2a = 15 + 2a + -2a Combine like terms: 4a + -2a = 2a 1 + 2a = 15 + 2a + -2a Combine like terms: 2a + -2a = 0 1 + 2a = 15 + 0 1 + 2a = 15 Add '-1' to each side of the equation. 1 + -1 + 2a = 15 + -1 Combine like terms: 1 + -1 = 0 0 + 2a = 15 + -1 2a = 15 + -1 Combine like terms: 15 + -1 = 14 2a = 14 Divide each side by '2'. a = 7 Simplifying a = 7
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