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Simplifying -1(r + 1) = -18 Reorder the terms: -1(1 + r) = -18 (1 * -1 + r * -1) = -18 (-1 + -1r) = -18 Solving -1 + -1r = -18 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 = -18 + 1 Combine like terms: -1 + 1 = 0 0 + -1r = -18 + 1 -1r = -18 + 1 Combine like terms: -18 + 1 = -17 -1r = -17 Divide each side by '-1'. r = 17 Simplifying r = 17
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