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Simplifying 60 + -4r = 9r + 18 Reorder the terms: 60 + -4r = 18 + 9r Solving 60 + -4r = 18 + 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. 60 + -4r + -9r = 18 + 9r + -9r Combine like terms: -4r + -9r = -13r 60 + -13r = 18 + 9r + -9r Combine like terms: 9r + -9r = 0 60 + -13r = 18 + 0 60 + -13r = 18 Add '-60' to each side of the equation. 60 + -60 + -13r = 18 + -60 Combine like terms: 60 + -60 = 0 0 + -13r = 18 + -60 -13r = 18 + -60 Combine like terms: 18 + -60 = -42 -13r = -42 Divide each side by '-13'. r = 3.230769231 Simplifying r = 3.230769231
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