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Simplifying 20 = 4r + 4 Reorder the terms: 20 = 4 + 4r Solving 20 = 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 + -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 = -16 -4r = -16 Divide each side by '-4'. r = 4 Simplifying r = 4
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