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Simplifying -1(r + 3) = 15 Reorder the terms: -1(3 + r) = 15 (3 * -1 + r * -1) = 15 (-3 + -1r) = 15 Solving -3 + -1r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1r = 15 + 3 Combine like terms: -3 + 3 = 0 0 + -1r = 15 + 3 -1r = 15 + 3 Combine like terms: 15 + 3 = 18 -1r = 18 Divide each side by '-1'. r = -18 Simplifying r = -18
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