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Simplifying 4r + -21 = 15 + -8n Reorder the terms: -21 + 4r = 15 + -8n Solving -21 + 4r = 15 + -8n 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 + 4r = 15 + 21 + -8n Combine like terms: -21 + 21 = 0 0 + 4r = 15 + 21 + -8n 4r = 15 + 21 + -8n Combine like terms: 15 + 21 = 36 4r = 36 + -8n Divide each side by '4'. r = 9 + -2n Simplifying r = 9 + -2n
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