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