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Simplifying 8x2 + 72a + -81 = 0 Reorder the terms: -81 + 72a + 8x2 = 0 Solving -81 + 72a + 8x2 = 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 + 72a + 81 + 8x2 = 0 + 81 Reorder the terms: -81 + 81 + 72a + 8x2 = 0 + 81 Combine like terms: -81 + 81 = 0 0 + 72a + 8x2 = 0 + 81 72a + 8x2 = 0 + 81 Combine like terms: 0 + 81 = 81 72a + 8x2 = 81 Add '-8x2' to each side of the equation. 72a + 8x2 + -8x2 = 81 + -8x2 Combine like terms: 8x2 + -8x2 = 0 72a + 0 = 81 + -8x2 72a = 81 + -8x2 Divide each side by '72'. a = 1.125 + -0.1111111111x2 Simplifying a = 1.125 + -0.1111111111x2
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