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Simplifying 81 = 3a + -4a Combine like terms: 3a + -4a = -1a 81 = -1a Solving 81 = -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. 81 + a = -1a + a Combine like terms: -1a + a = 0 81 + a = 0 Add '-81' to each side of the equation. 81 + -81 + a = 0 + -81 Combine like terms: 81 + -81 = 0 0 + a = 0 + -81 a = 0 + -81 Combine like terms: 0 + -81 = -81 a = -81 Simplifying a = -81
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