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Simplifying 25 = 13 + -4r Solving 25 = 13 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 25 + 4r = 13 + -4r + 4r Combine like terms: -4r + 4r = 0 25 + 4r = 13 + 0 25 + 4r = 13 Add '-25' to each side of the equation. 25 + -25 + 4r = 13 + -25 Combine like terms: 25 + -25 = 0 0 + 4r = 13 + -25 4r = 13 + -25 Combine like terms: 13 + -25 = -12 4r = -12 Divide each side by '4'. r = -3 Simplifying r = -3
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