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Simplifying 2r + 3(r + 4) = 0 Reorder the terms: 2r + 3(4 + r) = 0 2r + (4 * 3 + r * 3) = 0 2r + (12 + 3r) = 0 Reorder the terms: 12 + 2r + 3r = 0 Combine like terms: 2r + 3r = 5r 12 + 5r = 0 Solving 12 + 5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 5r = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 5r = 0 + -12 5r = 0 + -12 Combine like terms: 0 + -12 = -12 5r = -12 Divide each side by '5'. r = -2.4 Simplifying r = -2.4
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