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Simplifying 8r + 13 + -4r + 40 = 0 Reorder the terms: 13 + 40 + 8r + -4r = 0 Combine like terms: 13 + 40 = 53 53 + 8r + -4r = 0 Combine like terms: 8r + -4r = 4r 53 + 4r = 0 Solving 53 + 4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-53' to each side of the equation. 53 + -53 + 4r = 0 + -53 Combine like terms: 53 + -53 = 0 0 + 4r = 0 + -53 4r = 0 + -53 Combine like terms: 0 + -53 = -53 4r = -53 Divide each side by '4'. r = -13.25 Simplifying r = -13.25
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