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Simplifying 21a + 3b + 81 = 0 Reorder the terms: 81 + 21a + 3b = 0 Solving 81 + 21a + 3b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + 21a + -81 + 3b = 0 + -81 Reorder the terms: 81 + -81 + 21a + 3b = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 21a + 3b = 0 + -81 21a + 3b = 0 + -81 Combine like terms: 0 + -81 = -81 21a + 3b = -81 Add '-3b' to each side of the equation. 21a + 3b + -3b = -81 + -3b Combine like terms: 3b + -3b = 0 21a + 0 = -81 + -3b 21a = -81 + -3b Divide each side by '21'. a = -3.857142857 + -0.1428571429b Simplifying a = -3.857142857 + -0.1428571429b
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