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Simplifying -9r + 20 = r Reorder the terms: 20 + -9r = r Solving 20 + -9r = 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 + -9r + -1r = r + -1r Combine like terms: -9r + -1r = -10r 20 + -10r = r + -1r Combine like terms: r + -1r = 0 20 + -10r = 0 Add '-20' to each side of the equation. 20 + -20 + -10r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -10r = 0 + -20 -10r = 0 + -20 Combine like terms: 0 + -20 = -20 -10r = -20 Divide each side by '-10'. r = 2 Simplifying r = 2
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