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Simplifying 2r + 7r + -1r + -9 = 0 Reorder the terms: -9 + 2r + 7r + -1r = 0 Combine like terms: 2r + 7r = 9r -9 + 9r + -1r = 0 Combine like terms: 9r + -1r = 8r -9 + 8r = 0 Solving -9 + 8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 8r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 8r = 0 + 9 8r = 0 + 9 Combine like terms: 0 + 9 = 9 8r = 9 Divide each side by '8'. r = 1.125 Simplifying r = 1.125
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