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Simplifying 20 = r + 9 Reorder the terms: 20 = 9 + r Solving 20 = 9 + 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. 20 + -1r = 9 + r + -1r Combine like terms: r + -1r = 0 20 + -1r = 9 + 0 20 + -1r = 9 Add '-20' to each side of the equation. 20 + -20 + -1r = 9 + -20 Combine like terms: 20 + -20 = 0 0 + -1r = 9 + -20 -1r = 9 + -20 Combine like terms: 9 + -20 = -11 -1r = -11 Divide each side by '-1'. r = 11 Simplifying r = 11
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