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Simplifying 99 = 21r + 56 Reorder the terms: 99 = 56 + 21r Solving 99 = 56 + 21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21r' to each side of the equation. 99 + -21r = 56 + 21r + -21r Combine like terms: 21r + -21r = 0 99 + -21r = 56 + 0 99 + -21r = 56 Add '-99' to each side of the equation. 99 + -99 + -21r = 56 + -99 Combine like terms: 99 + -99 = 0 0 + -21r = 56 + -99 -21r = 56 + -99 Combine like terms: 56 + -99 = -43 -21r = -43 Divide each side by '-21'. r = 2.047619048 Simplifying r = 2.047619048
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