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Simplifying 13r + -28 = 9r Reorder the terms: -28 + 13r = 9r Solving -28 + 13r = 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -28 + 13r + -9r = 9r + -9r Combine like terms: 13r + -9r = 4r -28 + 4r = 9r + -9r Combine like terms: 9r + -9r = 0 -28 + 4r = 0 Add '28' to each side of the equation. -28 + 28 + 4r = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 4r = 0 + 28 4r = 0 + 28 Combine like terms: 0 + 28 = 28 4r = 28 Divide each side by '4'. r = 7 Simplifying r = 7
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