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