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Simplifying -2(r + -5) + 11 = 9 Reorder the terms: -2(-5 + r) + 11 = 9 (-5 * -2 + r * -2) + 11 = 9 (10 + -2r) + 11 = 9 Reorder the terms: 10 + 11 + -2r = 9 Combine like terms: 10 + 11 = 21 21 + -2r = 9 Solving 21 + -2r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -2r = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -2r = 9 + -21 -2r = 9 + -21 Combine like terms: 9 + -21 = -12 -2r = -12 Divide each side by '-2'. r = 6 Simplifying r = 6
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