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Simplifying -2(r + 5) = -21 Reorder the terms: -2(5 + r) = -21 (5 * -2 + r * -2) = -21 (-10 + -2r) = -21 Solving -10 + -2r = -21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -2r = -21 + 10 Combine like terms: -10 + 10 = 0 0 + -2r = -21 + 10 -2r = -21 + 10 Combine like terms: -21 + 10 = -11 -2r = -11 Divide each side by '-2'. r = 5.5 Simplifying r = 5.5
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