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Simplifying 6r + -9 + 9 = -1r Reorder the terms: -9 + 9 + 6r = -1r Combine like terms: -9 + 9 = 0 0 + 6r = -1r 6r = -1r Solving 6r = -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 6r + r = -1r + r Combine like terms: 6r + r = 7r 7r = -1r + r Combine like terms: -1r + r = 0 7r = 0 Divide each side by '7'. r = 0 Simplifying r = 0
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