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Simplifying 81a + 13 = 9a Reorder the terms: 13 + 81a = 9a Solving 13 + 81a = 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 13 + 81a + -9a = 9a + -9a Combine like terms: 81a + -9a = 72a 13 + 72a = 9a + -9a Combine like terms: 9a + -9a = 0 13 + 72a = 0 Add '-13' to each side of the equation. 13 + -13 + 72a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 72a = 0 + -13 72a = 0 + -13 Combine like terms: 0 + -13 = -13 72a = -13 Divide each side by '72'. a = -0.1805555556 Simplifying a = -0.1805555556
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