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Simplifying -1 + 2r + -1s = 0 Solving -1 + 2r + -1s = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 2r + 1 + -1s = 0 + 1 Reorder the terms: -1 + 1 + 2r + -1s = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 2r + -1s = 0 + 1 2r + -1s = 0 + 1 Combine like terms: 0 + 1 = 1 2r + -1s = 1 Add 's' to each side of the equation. 2r + -1s + s = 1 + s Combine like terms: -1s + s = 0 2r + 0 = 1 + s 2r = 1 + s Divide each side by '2'. r = 0.5 + 0.5s Simplifying r = 0.5 + 0.5s
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