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Simplifying 7r + -5r + 4 = 9r + 4r Reorder the terms: 4 + 7r + -5r = 9r + 4r Combine like terms: 7r + -5r = 2r 4 + 2r = 9r + 4r Combine like terms: 9r + 4r = 13r 4 + 2r = 13r Solving 4 + 2r = 13r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13r' to each side of the equation. 4 + 2r + -13r = 13r + -13r Combine like terms: 2r + -13r = -11r 4 + -11r = 13r + -13r Combine like terms: 13r + -13r = 0 4 + -11r = 0 Add '-4' to each side of the equation. 4 + -4 + -11r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -11r = 0 + -4 -11r = 0 + -4 Combine like terms: 0 + -4 = -4 -11r = -4 Divide each side by '-11'. r = 0.3636363636 Simplifying r = 0.3636363636
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