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Simplifying 4r + -81 = 225 Reorder the terms: -81 + 4r = 225 Solving -81 + 4r = 225 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 4r = 225 + 81 Combine like terms: -81 + 81 = 0 0 + 4r = 225 + 81 4r = 225 + 81 Combine like terms: 225 + 81 = 306 4r = 306 Divide each side by '4'. r = 76.5 Simplifying r = 76.5
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