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Simplifying -21 + 5r = 54 Solving -21 + 5r = 54 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 5r = 54 + 21 Combine like terms: -21 + 21 = 0 0 + 5r = 54 + 21 5r = 54 + 21 Combine like terms: 54 + 21 = 75 5r = 75 Divide each side by '5'. r = 15 Simplifying r = 15
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