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Simplifying 84 = 4r Solving 84 = 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. 84 + -4r = 4r + -4r Combine like terms: 4r + -4r = 0 84 + -4r = 0 Add '-84' to each side of the equation. 84 + -84 + -4r = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -4r = 0 + -84 -4r = 0 + -84 Combine like terms: 0 + -84 = -84 -4r = -84 Divide each side by '-4'. r = 21 Simplifying r = 21
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