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Simplifying 9r + -7 = 13 + 4r Reorder the terms: -7 + 9r = 13 + 4r Solving -7 + 9r = 13 + 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. -7 + 9r + -4r = 13 + 4r + -4r Combine like terms: 9r + -4r = 5r -7 + 5r = 13 + 4r + -4r Combine like terms: 4r + -4r = 0 -7 + 5r = 13 + 0 -7 + 5r = 13 Add '7' to each side of the equation. -7 + 7 + 5r = 13 + 7 Combine like terms: -7 + 7 = 0 0 + 5r = 13 + 7 5r = 13 + 7 Combine like terms: 13 + 7 = 20 5r = 20 Divide each side by '5'. r = 4 Simplifying r = 4
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