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Simplifying 81a + -12a + 4 = 0 Reorder the terms: 4 + 81a + -12a = 0 Combine like terms: 81a + -12a = 69a 4 + 69a = 0 Solving 4 + 69a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 69a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 69a = 0 + -4 69a = 0 + -4 Combine like terms: 0 + -4 = -4 69a = -4 Divide each side by '69'. a = -0.05797101449 Simplifying a = -0.05797101449
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