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Simplifying 4 + -9 = 13r + 18 Combine like terms: 4 + -9 = -5 -5 = 13r + 18 Reorder the terms: -5 = 18 + 13r Solving -5 = 18 + 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. -5 + -13r = 18 + 13r + -13r Combine like terms: 13r + -13r = 0 -5 + -13r = 18 + 0 -5 + -13r = 18 Add '5' to each side of the equation. -5 + 5 + -13r = 18 + 5 Combine like terms: -5 + 5 = 0 0 + -13r = 18 + 5 -13r = 18 + 5 Combine like terms: 18 + 5 = 23 -13r = 23 Divide each side by '-13'. r = -1.769230769 Simplifying r = -1.769230769
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