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Simplifying 5r + -9 = 15 + r Reorder the terms: -9 + 5r = 15 + r Solving -9 + 5r = 15 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -9 + 5r + -1r = 15 + r + -1r Combine like terms: 5r + -1r = 4r -9 + 4r = 15 + r + -1r Combine like terms: r + -1r = 0 -9 + 4r = 15 + 0 -9 + 4r = 15 Add '9' to each side of the equation. -9 + 9 + 4r = 15 + 9 Combine like terms: -9 + 9 = 0 0 + 4r = 15 + 9 4r = 15 + 9 Combine like terms: 15 + 9 = 24 4r = 24 Divide each side by '4'. r = 6 Simplifying r = 6
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