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