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Simplifying -20 + 8r = 4(r + 1) Reorder the terms: -20 + 8r = 4(1 + r) -20 + 8r = (1 * 4 + r * 4) -20 + 8r = (4 + 4r) Solving -20 + 8r = 4 + 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. -20 + 8r + -4r = 4 + 4r + -4r Combine like terms: 8r + -4r = 4r -20 + 4r = 4 + 4r + -4r Combine like terms: 4r + -4r = 0 -20 + 4r = 4 + 0 -20 + 4r = 4 Add '20' to each side of the equation. -20 + 20 + 4r = 4 + 20 Combine like terms: -20 + 20 = 0 0 + 4r = 4 + 20 4r = 4 + 20 Combine like terms: 4 + 20 = 24 4r = 24 Divide each side by '4'. r = 6 Simplifying r = 6
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