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Simplifying (9r + -5) + -1(4r + 9) = 0 Reorder the terms: (-5 + 9r) + -1(4r + 9) = 0 Remove parenthesis around (-5 + 9r) -5 + 9r + -1(4r + 9) = 0 Reorder the terms: -5 + 9r + -1(9 + 4r) = 0 -5 + 9r + (9 * -1 + 4r * -1) = 0 -5 + 9r + (-9 + -4r) = 0 Reorder the terms: -5 + -9 + 9r + -4r = 0 Combine like terms: -5 + -9 = -14 -14 + 9r + -4r = 0 Combine like terms: 9r + -4r = 5r -14 + 5r = 0 Solving -14 + 5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 5r = 0 + 14 Combine like terms: -14 + 14 = 0 0 + 5r = 0 + 14 5r = 0 + 14 Combine like terms: 0 + 14 = 14 5r = 14 Divide each side by '5'. r = 2.8 Simplifying r = 2.8
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