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Simplifying -9 + 8r = r + 7 + 3r Reorder the terms: -9 + 8r = 7 + r + 3r Combine like terms: r + 3r = 4r -9 + 8r = 7 + 4r Solving -9 + 8r = 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. -9 + 8r + -4r = 7 + 4r + -4r Combine like terms: 8r + -4r = 4r -9 + 4r = 7 + 4r + -4r Combine like terms: 4r + -4r = 0 -9 + 4r = 7 + 0 -9 + 4r = 7 Add '9' to each side of the equation. -9 + 9 + 4r = 7 + 9 Combine like terms: -9 + 9 = 0 0 + 4r = 7 + 9 4r = 7 + 9 Combine like terms: 7 + 9 = 16 4r = 16 Divide each side by '4'. r = 4 Simplifying r = 4
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