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Simplifying -8 + 9r = 7 + 4r Solving -8 + 9r = 7 + 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. -8 + 9r + -4r = 7 + 4r + -4r Combine like terms: 9r + -4r = 5r -8 + 5r = 7 + 4r + -4r Combine like terms: 4r + -4r = 0 -8 + 5r = 7 + 0 -8 + 5r = 7 Add '8' to each side of the equation. -8 + 8 + 5r = 7 + 8 Combine like terms: -8 + 8 = 0 0 + 5r = 7 + 8 5r = 7 + 8 Combine like terms: 7 + 8 = 15 5r = 15 Divide each side by '5'. r = 3 Simplifying r = 3
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