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Simplifying 8r + -9 = -15 + -5r Reorder the terms: -9 + 8r = -15 + -5r Solving -9 + 8r = -15 + -5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5r' to each side of the equation. -9 + 8r + 5r = -15 + -5r + 5r Combine like terms: 8r + 5r = 13r -9 + 13r = -15 + -5r + 5r Combine like terms: -5r + 5r = 0 -9 + 13r = -15 + 0 -9 + 13r = -15 Add '9' to each side of the equation. -9 + 9 + 13r = -15 + 9 Combine like terms: -9 + 9 = 0 0 + 13r = -15 + 9 13r = -15 + 9 Combine like terms: -15 + 9 = -6 13r = -6 Divide each side by '13'. r = -0.4615384615 Simplifying r = -0.4615384615
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