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Simplifying (9 + 12) = r + -8 Combine like terms: 9 + 12 = 21 (21) = r + -8 21 = r + -8 Reorder the terms: 21 = -8 + r Solving 21 = -8 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 21 + -1r = -8 + r + -1r Combine like terms: r + -1r = 0 21 + -1r = -8 + 0 21 + -1r = -8 Add '-21' to each side of the equation. 21 + -21 + -1r = -8 + -21 Combine like terms: 21 + -21 = 0 0 + -1r = -8 + -21 -1r = -8 + -21 Combine like terms: -8 + -21 = -29 -1r = -29 Divide each side by '-1'. r = 29 Simplifying r = 29
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