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Simplifying 1 + -1[r + 2] = 9 Reorder the terms: 1 + -1[2 + r] = 9 1 + [2 * -1 + r * -1] = 9 1 + [-2 + -1r] = 9 Combine like terms: 1 + -2 = -1 -1 + -1r = 9 Solving -1 + -1r = 9 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 = 9 + 1 Combine like terms: -1 + 1 = 0 0 + -1r = 9 + 1 -1r = 9 + 1 Combine like terms: 9 + 1 = 10 -1r = 10 Divide each side by '-1'. r = -10 Simplifying r = -10
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