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Simplifying 2.50r + 4.00 = 21 Reorder the terms: 4.00 + 2.50r = 21 Solving 4.00 + 2.50r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4.00' to each side of the equation. 4.00 + -4.00 + 2.50r = 21 + -4.00 Combine like terms: 4.00 + -4.00 = 0.00 0.00 + 2.50r = 21 + -4.00 2.50r = 21 + -4.00 Combine like terms: 21 + -4.00 = 17 2.50r = 17 Divide each side by '2.50'. r = 6.8 Simplifying r = 6.8
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