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Simplifying -8 + 5r = 5r + -1r Combine like terms: 5r + -1r = 4r -8 + 5r = 4r Solving -8 + 5r = 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 + 5r + -4r = 4r + -4r Combine like terms: 5r + -4r = 1r -8 + 1r = 4r + -4r Combine like terms: 4r + -4r = 0 -8 + 1r = 0 Add '8' to each side of the equation. -8 + 8 + 1r = 0 + 8 Combine like terms: -8 + 8 = 0 0 + 1r = 0 + 8 1r = 0 + 8 Combine like terms: 0 + 8 = 8 1r = 8 Divide each side by '1'. r = 8 Simplifying r = 8
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