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Simplifying 8 = 4(r + 5) Reorder the terms: 8 = 4(5 + r) 8 = (5 * 4 + r * 4) 8 = (20 + 4r) Solving 8 = 20 + 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. 8 + -4r = 20 + 4r + -4r Combine like terms: 4r + -4r = 0 8 + -4r = 20 + 0 8 + -4r = 20 Add '-8' to each side of the equation. 8 + -8 + -4r = 20 + -8 Combine like terms: 8 + -8 = 0 0 + -4r = 20 + -8 -4r = 20 + -8 Combine like terms: 20 + -8 = 12 -4r = 12 Divide each side by '-4'. r = -3 Simplifying r = -3
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