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Simplifying -8 = 1 + 4r + 5r Combine like terms: 4r + 5r = 9r -8 = 1 + 9r Solving -8 = 1 + 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. -8 + -9r = 1 + 9r + -9r Combine like terms: 9r + -9r = 0 -8 + -9r = 1 + 0 -8 + -9r = 1 Add '8' to each side of the equation. -8 + 8 + -9r = 1 + 8 Combine like terms: -8 + 8 = 0 0 + -9r = 1 + 8 -9r = 1 + 8 Combine like terms: 1 + 8 = 9 -9r = 9 Divide each side by '-9'. r = -1 Simplifying r = -1
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