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Simplifying 2r + 7r = 6 + r + -1 + -5 Combine like terms: 2r + 7r = 9r 9r = 6 + r + -1 + -5 Reorder the terms: 9r = 6 + -1 + -5 + r Combine like terms: 6 + -1 = 5 9r = 5 + -5 + r Combine like terms: 5 + -5 = 0 9r = 0 + r 9r = r Solving 9r = 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. 9r + -1r = r + -1r Combine like terms: 9r + -1r = 8r 8r = r + -1r Combine like terms: r + -1r = 0 8r = 0 Divide each side by '8'. r = 0 Simplifying r = 0
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