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Simplifying 81 = 8a + -1a Combine like terms: 8a + -1a = 7a 81 = 7a Solving 81 = 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 81 + -7a = 7a + -7a Combine like terms: 7a + -7a = 0 81 + -7a = 0 Add '-81' to each side of the equation. 81 + -81 + -7a = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -7a = 0 + -81 -7a = 0 + -81 Combine like terms: 0 + -81 = -81 -7a = -81 Divide each side by '-7'. a = 11.57142857 Simplifying a = 11.57142857
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