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Simplifying 1 + r + s = 2a Solving 1 + r + s = 2a 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 + r + -1 + s = -1 + 2a Reorder the terms: 1 + -1 + r + s = -1 + 2a Combine like terms: 1 + -1 = 0 0 + r + s = -1 + 2a r + s = -1 + 2a Add '-1s' to each side of the equation. r + s + -1s = -1 + 2a + -1s Combine like terms: s + -1s = 0 r + 0 = -1 + 2a + -1s r = -1 + 2a + -1s Simplifying r = -1 + 2a + -1s
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