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Simplifying 1 + -2r = -4r + -9 Reorder the terms: 1 + -2r = -9 + -4r Solving 1 + -2r = -9 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 1 + -2r + 4r = -9 + -4r + 4r Combine like terms: -2r + 4r = 2r 1 + 2r = -9 + -4r + 4r Combine like terms: -4r + 4r = 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 = -10 2r = -10 Divide each side by '2'. r = -5 Simplifying r = -5
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