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Simplifying 8 = 4r + 13 Reorder the terms: 8 = 13 + 4r Solving 8 = 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. 8 + -4r = 13 + 4r + -4r Combine like terms: 4r + -4r = 0 8 + -4r = 13 + 0 8 + -4r = 13 Add '-8' to each side of the equation. 8 + -8 + -4r = 13 + -8 Combine like terms: 8 + -8 = 0 0 + -4r = 13 + -8 -4r = 13 + -8 Combine like terms: 13 + -8 = 5 -4r = 5 Divide each side by '-4'. r = -1.25 Simplifying r = -1.25
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