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Simplifying -21 = -8r + 6 + 5 Reorder the terms: -21 = 6 + 5 + -8r Combine like terms: 6 + 5 = 11 -21 = 11 + -8r Solving -21 = 11 + -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. -21 + 8r = 11 + -8r + 8r Combine like terms: -8r + 8r = 0 -21 + 8r = 11 + 0 -21 + 8r = 11 Add '21' to each side of the equation. -21 + 21 + 8r = 11 + 21 Combine like terms: -21 + 21 = 0 0 + 8r = 11 + 21 8r = 11 + 21 Combine like terms: 11 + 21 = 32 8r = 32 Divide each side by '8'. r = 4 Simplifying r = 4
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