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Simplifying 9 = 20r + -16r + 5r Combine like terms: 20r + -16r = 4r 9 = 4r + 5r Combine like terms: 4r + 5r = 9r 9 = 9r Solving 9 = 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. 9 + -9r = 9r + -9r Combine like terms: 9r + -9r = 0 9 + -9r = 0 Add '-9' to each side of the equation. 9 + -9 + -9r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -9r = 0 + -9 -9r = 0 + -9 Combine like terms: 0 + -9 = -9 -9r = -9 Divide each side by '-9'. r = 1 Simplifying r = 1
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