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Simplifying 21 = 5r Solving 21 = 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 21 + -5r = 5r + -5r Combine like terms: 5r + -5r = 0 21 + -5r = 0 Add '-21' to each side of the equation. 21 + -21 + -5r = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -5r = 0 + -21 -5r = 0 + -21 Combine like terms: 0 + -21 = -21 -5r = -21 Divide each side by '-5'. r = 4.2 Simplifying r = 4.2
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