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Simplifying 13 + -8r + -9 = 25 Reorder the terms: 13 + -9 + -8r = 25 Combine like terms: 13 + -9 = 4 4 + -8r = 25 Solving 4 + -8r = 25 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -8r = 25 + -4 Combine like terms: 4 + -4 = 0 0 + -8r = 25 + -4 -8r = 25 + -4 Combine like terms: 25 + -4 = 21 -8r = 21 Divide each side by '-8'. r = -2.625 Simplifying r = -2.625
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