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Simplifying 21 = 6r + 5 + -1r Reorder the terms: 21 = 5 + 6r + -1r Combine like terms: 6r + -1r = 5r 21 = 5 + 5r Solving 21 = 5 + 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 = 5 + 5r + -5r Combine like terms: 5r + -5r = 0 21 + -5r = 5 + 0 21 + -5r = 5 Add '-21' to each side of the equation. 21 + -21 + -5r = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -5r = 5 + -21 -5r = 5 + -21 Combine like terms: 5 + -21 = -16 -5r = -16 Divide each side by '-5'. r = 3.2 Simplifying r = 3.2
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