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Simplifying r + 20 = 9r + -4 Reorder the terms: 20 + r = 9r + -4 Reorder the terms: 20 + r = -4 + 9r Solving 20 + r = -4 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 20 + r + -9r = -4 + 9r + -9r Combine like terms: r + -9r = -8r 20 + -8r = -4 + 9r + -9r Combine like terms: 9r + -9r = 0 20 + -8r = -4 + 0 20 + -8r = -4 Add '-20' to each side of the equation. 20 + -20 + -8r = -4 + -20 Combine like terms: 20 + -20 = 0 0 + -8r = -4 + -20 -8r = -4 + -20 Combine like terms: -4 + -20 = -24 -8r = -24 Divide each side by '-8'. r = 3 Simplifying r = 3
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