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Simplifying 4r + -9 = 91 Reorder the terms: -9 + 4r = 91 Solving -9 + 4r = 91 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 4r = 91 + 9 Combine like terms: -9 + 9 = 0 0 + 4r = 91 + 9 4r = 91 + 9 Combine like terms: 91 + 9 = 100 4r = 100 Divide each side by '4'. r = 25 Simplifying r = 25
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