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Simplifying 2r + -5 = n(n + -4) Reorder the terms: -5 + 2r = n(n + -4) Reorder the terms: -5 + 2r = n(-4 + n) -5 + 2r = (-4 * n + n * n) -5 + 2r = (-4n + n2) Solving -5 + 2r = -4n + n2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 2r = -4n + 5 + n2 Combine like terms: -5 + 5 = 0 0 + 2r = -4n + 5 + n2 2r = -4n + 5 + n2 Reorder the terms: 2r = 5 + -4n + n2 Divide each side by '2'. r = 2.5 + -2n + 0.5n2 Simplifying r = 2.5 + -2n + 0.5n2
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