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Simplifying 21r + 25 = 0 Reorder the terms: 25 + 21r = 0 Solving 25 + 21r = 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 + -25 + 21r = 0 + -25 Combine like terms: 25 + -25 = 0 0 + 21r = 0 + -25 21r = 0 + -25 Combine like terms: 0 + -25 = -25 21r = -25 Divide each side by '21'. r = -1.19047619 Simplifying r = -1.19047619
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