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Simplifying 3r + -8 = 13 + -4r Reorder the terms: -8 + 3r = 13 + -4r Solving -8 + 3r = 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 + 3r + 4r = 13 + -4r + 4r Combine like terms: 3r + 4r = 7r -8 + 7r = 13 + -4r + 4r Combine like terms: -4r + 4r = 0 -8 + 7r = 13 + 0 -8 + 7r = 13 Add '8' to each side of the equation. -8 + 8 + 7r = 13 + 8 Combine like terms: -8 + 8 = 0 0 + 7r = 13 + 8 7r = 13 + 8 Combine like terms: 13 + 8 = 21 7r = 21 Divide each side by '7'. r = 3 Simplifying r = 3
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