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Simplifying 7r + -1 + 9r = -15 Reorder the terms: -1 + 7r + 9r = -15 Combine like terms: 7r + 9r = 16r -1 + 16r = -15 Solving -1 + 16r = -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 + 16r = -15 + 1 Combine like terms: -1 + 1 = 0 0 + 16r = -15 + 1 16r = -15 + 1 Combine like terms: -15 + 1 = -14 16r = -14 Divide each side by '16'. r = -0.875 Simplifying r = -0.875
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