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Simplifying 8r + -2 = -9 + r Reorder the terms: -2 + 8r = -9 + r Solving -2 + 8r = -9 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -2 + 8r + -1r = -9 + r + -1r Combine like terms: 8r + -1r = 7r -2 + 7r = -9 + r + -1r Combine like terms: r + -1r = 0 -2 + 7r = -9 + 0 -2 + 7r = -9 Add '2' to each side of the equation. -2 + 2 + 7r = -9 + 2 Combine like terms: -2 + 2 = 0 0 + 7r = -9 + 2 7r = -9 + 2 Combine like terms: -9 + 2 = -7 7r = -7 Divide each side by '7'. r = -1 Simplifying r = -1
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