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Simplifying 91 = 23 + -4r Solving 91 = 23 + -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. 91 + 4r = 23 + -4r + 4r Combine like terms: -4r + 4r = 0 91 + 4r = 23 + 0 91 + 4r = 23 Add '-91' to each side of the equation. 91 + -91 + 4r = 23 + -91 Combine like terms: 91 + -91 = 0 0 + 4r = 23 + -91 4r = 23 + -91 Combine like terms: 23 + -91 = -68 4r = -68 Divide each side by '4'. r = -17 Simplifying r = -17
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