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Simplifying r + 4 = 8 + -1r Reorder the terms: 4 + r = 8 + -1r Solving 4 + r = 8 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 4 + r + r = 8 + -1r + r Combine like terms: r + r = 2r 4 + 2r = 8 + -1r + r Combine like terms: -1r + r = 0 4 + 2r = 8 + 0 4 + 2r = 8 Add '-4' to each side of the equation. 4 + -4 + 2r = 8 + -4 Combine like terms: 4 + -4 = 0 0 + 2r = 8 + -4 2r = 8 + -4 Combine like terms: 8 + -4 = 4 2r = 4 Divide each side by '2'. r = 2 Simplifying r = 2
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