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Simplifying 9r + 1 + -7r = -15 Reorder the terms: 1 + 9r + -7r = -15 Combine like terms: 9r + -7r = 2r 1 + 2r = -15 Solving 1 + 2r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2r = -15 + -1 Combine like terms: 1 + -1 = 0 0 + 2r = -15 + -1 2r = -15 + -1 Combine like terms: -15 + -1 = -16 2r = -16 Divide each side by '2'. r = -8 Simplifying r = -8
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