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Simplifying n2 + 4a + -21 = 0 Reorder the terms: -21 + 4a + n2 = 0 Solving -21 + 4a + n2 = 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 + 4a + 21 + n2 = 0 + 21 Reorder the terms: -21 + 21 + 4a + n2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 4a + n2 = 0 + 21 4a + n2 = 0 + 21 Combine like terms: 0 + 21 = 21 4a + n2 = 21 Add '-1n2' to each side of the equation. 4a + n2 + -1n2 = 21 + -1n2 Combine like terms: n2 + -1n2 = 0 4a + 0 = 21 + -1n2 4a = 21 + -1n2 Divide each side by '4'. a = 5.25 + -0.25n2 Simplifying a = 5.25 + -0.25n2
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