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Simplifying -1(-1r + 1) = 0 Reorder the terms: -1(1 + -1r) = 0 (1 * -1 + -1r * -1) = 0 (-1 + 1r) = 0 Solving -1 + 1r = 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 + 1 + 1r = 0 + 1 Combine like terms: -1 + 1 = 0 0 + 1r = 0 + 1 1r = 0 + 1 Combine like terms: 0 + 1 = 1 1r = 1 Divide each side by '1'. r = 1 Simplifying r = 1
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