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Simplifying 3r + 5(2r + 4) = 0 Reorder the terms: 3r + 5(4 + 2r) = 0 3r + (4 * 5 + 2r * 5) = 0 3r + (20 + 10r) = 0 Reorder the terms: 20 + 3r + 10r = 0 Combine like terms: 3r + 10r = 13r 20 + 13r = 0 Solving 20 + 13r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 13r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 13r = 0 + -20 13r = 0 + -20 Combine like terms: 0 + -20 = -20 13r = -20 Divide each side by '13'. r = -1.538461538 Simplifying r = -1.538461538
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