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Simplifying -9 + 9r = -4r Solving -9 + 9r = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -9 + 9r + 4r = -4r + 4r Combine like terms: 9r + 4r = 13r -9 + 13r = -4r + 4r Combine like terms: -4r + 4r = 0 -9 + 13r = 0 Add '9' to each side of the equation. -9 + 9 + 13r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 13r = 0 + 9 13r = 0 + 9 Combine like terms: 0 + 9 = 9 13r = 9 Divide each side by '13'. r = 0.6923076923 Simplifying r = 0.6923076923
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