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Simplifying -9 + -4r = 5r + 9 Reorder the terms: -9 + -4r = 9 + 5r Solving -9 + -4r = 9 + 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 + -4r + -5r = 9 + 5r + -5r Combine like terms: -4r + -5r = -9r -9 + -9r = 9 + 5r + -5r Combine like terms: 5r + -5r = 0 -9 + -9r = 9 + 0 -9 + -9r = 9 Add '9' to each side of the equation. -9 + 9 + -9r = 9 + 9 Combine like terms: -9 + 9 = 0 0 + -9r = 9 + 9 -9r = 9 + 9 Combine like terms: 9 + 9 = 18 -9r = 18 Divide each side by '-9'. r = -2 Simplifying r = -2
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