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Simplifying 1 = 9 + -2r Solving 1 = 9 + -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 = 9 + -2r + 2r Combine like terms: -2r + 2r = 0 1 + 2r = 9 + 0 1 + 2r = 9 Add '-1' to each side of the equation. 1 + -1 + 2r = 9 + -1 Combine like terms: 1 + -1 = 0 0 + 2r = 9 + -1 2r = 9 + -1 Combine like terms: 9 + -1 = 8 2r = 8 Divide each side by '2'. r = 4 Simplifying r = 4
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