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Simplifying 54 = 4r + 5r Combine like terms: 4r + 5r = 9r 54 = 9r Solving 54 = 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. 54 + -9r = 9r + -9r Combine like terms: 9r + -9r = 0 54 + -9r = 0 Add '-54' to each side of the equation. 54 + -54 + -9r = 0 + -54 Combine like terms: 54 + -54 = 0 0 + -9r = 0 + -54 -9r = 0 + -54 Combine like terms: 0 + -54 = -54 -9r = -54 Divide each side by '-9'. r = 6 Simplifying r = 6
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