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Simplifying 1 + r + -2r + -1 = -2 + 7r Reorder the terms: 1 + -1 + r + -2r = -2 + 7r Combine like terms: 1 + -1 = 0 0 + r + -2r = -2 + 7r r + -2r = -2 + 7r Combine like terms: r + -2r = -1r -1r = -2 + 7r Solving -1r = -2 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -1r + -7r = -2 + 7r + -7r Combine like terms: -1r + -7r = -8r -8r = -2 + 7r + -7r Combine like terms: 7r + -7r = 0 -8r = -2 + 0 -8r = -2 Divide each side by '-8'. r = 0.25 Simplifying r = 0.25
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