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Simplifying -1 = -2r + 8 Reorder the terms: -1 = 8 + -2r Solving -1 = 8 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. -1 + 2r = 8 + -2r + 2r Combine like terms: -2r + 2r = 0 -1 + 2r = 8 + 0 -1 + 2r = 8 Add '1' to each side of the equation. -1 + 1 + 2r = 8 + 1 Combine like terms: -1 + 1 = 0 0 + 2r = 8 + 1 2r = 8 + 1 Combine like terms: 8 + 1 = 9 2r = 9 Divide each side by '2'. r = 4.5 Simplifying r = 4.5
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