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Simplifying -21r + 25 = -38 Reorder the terms: 25 + -21r = -38 Solving 25 + -21r = -38 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 = -38 + -25 Combine like terms: 25 + -25 = 0 0 + -21r = -38 + -25 -21r = -38 + -25 Combine like terms: -38 + -25 = -63 -21r = -63 Divide each side by '-21'. r = 3 Simplifying r = 3
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