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Simplifying x2 + 8a + -21 = 0 Reorder the terms: -21 + 8a + x2 = 0 Solving -21 + 8a + x2 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 8a + 21 + x2 = 0 + 21 Reorder the terms: -21 + 21 + 8a + x2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 8a + x2 = 0 + 21 8a + x2 = 0 + 21 Combine like terms: 0 + 21 = 21 8a + x2 = 21 Add '-1x2' to each side of the equation. 8a + x2 + -1x2 = 21 + -1x2 Combine like terms: x2 + -1x2 = 0 8a + 0 = 21 + -1x2 8a = 21 + -1x2 Divide each side by '8'. a = 2.625 + -0.125x2 Simplifying a = 2.625 + -0.125x2
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