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Simplifying 1 + a = 13 + -1a Solving 1 + a = 13 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 1 + a + a = 13 + -1a + a Combine like terms: a + a = 2a 1 + 2a = 13 + -1a + a Combine like terms: -1a + a = 0 1 + 2a = 13 + 0 1 + 2a = 13 Add '-1' to each side of the equation. 1 + -1 + 2a = 13 + -1 Combine like terms: 1 + -1 = 0 0 + 2a = 13 + -1 2a = 13 + -1 Combine like terms: 13 + -1 = 12 2a = 12 Divide each side by '2'. a = 6 Simplifying a = 6
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