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Simplifying 8 + 2a = a + (-1) 8 + 2a = a + -1 Reorder the terms: 8 + 2a = -1 + a Solving 8 + 2a = -1 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 8 + 2a + -1a = -1 + a + -1a Combine like terms: 2a + -1a = 1a 8 + 1a = -1 + a + -1a Combine like terms: a + -1a = 0 8 + 1a = -1 + 0 8 + 1a = -1 Add '-8' to each side of the equation. 8 + -8 + 1a = -1 + -8 Combine like terms: 8 + -8 = 0 0 + 1a = -1 + -8 1a = -1 + -8 Combine like terms: -1 + -8 = -9 1a = -9 Divide each side by '1'. a = -9 Simplifying a = -9
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