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Simplifying 1 + 4r + 1 + 8r = 0 Reorder the terms: 1 + 1 + 4r + 8r = 0 Combine like terms: 1 + 1 = 2 2 + 4r + 8r = 0 Combine like terms: 4r + 8r = 12r 2 + 12r = 0 Solving 2 + 12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 12r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 12r = 0 + -2 12r = 0 + -2 Combine like terms: 0 + -2 = -2 12r = -2 Divide each side by '12'. r = -0.1666666667 Simplifying r = -0.1666666667
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