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Simplifying (-2r + -1) = 11 Reorder the terms: (-1 + -2r) = 11 Remove parenthesis around (-1 + -2r) -1 + -2r = 11 Solving -1 + -2r = 11 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 + -2r = 11 + 1 Combine like terms: -1 + 1 = 0 0 + -2r = 11 + 1 -2r = 11 + 1 Combine like terms: 11 + 1 = 12 -2r = 12 Divide each side by '-2'. r = -6 Simplifying r = -6
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