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Simplifying 12r + 4r + 5r + 5 + -2 = 0 Reorder the terms: 5 + -2 + 12r + 4r + 5r = 0 Combine like terms: 5 + -2 = 3 3 + 12r + 4r + 5r = 0 Combine like terms: 12r + 4r = 16r 3 + 16r + 5r = 0 Combine like terms: 16r + 5r = 21r 3 + 21r = 0 Solving 3 + 21r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 21r = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 21r = 0 + -3 21r = 0 + -3 Combine like terms: 0 + -3 = -3 21r = -3 Divide each side by '21'. r = -0.1428571429 Simplifying r = -0.1428571429
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