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Simplifying 5r + (4r + -13) = 0 Reorder the terms: 5r + (-13 + 4r) = 0 Remove parenthesis around (-13 + 4r) 5r + -13 + 4r = 0 Reorder the terms: -13 + 5r + 4r = 0 Combine like terms: 5r + 4r = 9r -13 + 9r = 0 Solving -13 + 9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 9r = 0 + 13 Combine like terms: -13 + 13 = 0 0 + 9r = 0 + 13 9r = 0 + 13 Combine like terms: 0 + 13 = 13 9r = 13 Divide each side by '9'. r = 1.444444444 Simplifying r = 1.444444444
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