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Simplifying r2 + 4r + n = 0 Reorder the terms: n + 4r + r2 = 0 Solving n + 4r + r2 = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4r' to each side of the equation. n + 4r + -4r + r2 = 0 + -4r Combine like terms: 4r + -4r = 0 n + 0 + r2 = 0 + -4r n + r2 = 0 + -4r Remove the zero: n + r2 = -4r Add '-1r2' to each side of the equation. n + r2 + -1r2 = -4r + -1r2 Combine like terms: r2 + -1r2 = 0 n + 0 = -4r + -1r2 n = -4r + -1r2 Simplifying n = -4r + -1r2
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