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