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Simplifying 4x2 + 20r + 25 = 0 Reorder the terms: 25 + 20r + 4x2 = 0 Solving 25 + 20r + 4x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + 20r + -25 + 4x2 = 0 + -25 Reorder the terms: 25 + -25 + 20r + 4x2 = 0 + -25 Combine like terms: 25 + -25 = 0 0 + 20r + 4x2 = 0 + -25 20r + 4x2 = 0 + -25 Combine like terms: 0 + -25 = -25 20r + 4x2 = -25 Add '-4x2' to each side of the equation. 20r + 4x2 + -4x2 = -25 + -4x2 Combine like terms: 4x2 + -4x2 = 0 20r + 0 = -25 + -4x2 20r = -25 + -4x2 Divide each side by '20'. r = -1.25 + -0.2x2 Simplifying r = -1.25 + -0.2x2
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