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Simplifying 2.25r + 4 = 21.50 Reorder the terms: 4 + 2.25r = 21.50 Solving 4 + 2.25r = 21.50 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2.25r = 21.50 + -4 Combine like terms: 4 + -4 = 0 0 + 2.25r = 21.50 + -4 2.25r = 21.50 + -4 Combine like terms: 21.50 + -4 = 17.5 2.25r = 17.5 Divide each side by '2.25'. r = 7.777777778 Simplifying r = 7.777777778
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