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Simplifying r + 5 + 15 = -1r Reorder the terms: 5 + 15 + r = -1r Combine like terms: 5 + 15 = 20 20 + r = -1r Solving 20 + r = -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. 20 + r + r = -1r + r Combine like terms: r + r = 2r 20 + 2r = -1r + r Combine like terms: -1r + r = 0 20 + 2r = 0 Add '-20' to each side of the equation. 20 + -20 + 2r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 2r = 0 + -20 2r = 0 + -20 Combine like terms: 0 + -20 = -20 2r = -20 Divide each side by '2'. r = -10 Simplifying r = -10
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