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Simplifying 10a + 1 + -8a = 81 Reorder the terms: 1 + 10a + -8a = 81 Combine like terms: 10a + -8a = 2a 1 + 2a = 81 Solving 1 + 2a = 81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2a = 81 + -1 Combine like terms: 1 + -1 = 0 0 + 2a = 81 + -1 2a = 81 + -1 Combine like terms: 81 + -1 = 80 2a = 80 Divide each side by '2'. a = 40 Simplifying a = 40
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