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Simplifying -7r + -2 + 9r + 7 = 0 Reorder the terms: -2 + 7 + -7r + 9r = 0 Combine like terms: -2 + 7 = 5 5 + -7r + 9r = 0 Combine like terms: -7r + 9r = 2r 5 + 2r = 0 Solving 5 + 2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 2r = 0 + -5 2r = 0 + -5 Combine like terms: 0 + -5 = -5 2r = -5 Divide each side by '2'. r = -2.5 Simplifying r = -2.5
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