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Simplifying 0.8(r + 5) + 0.4r = 0 Reorder the terms: 0.8(5 + r) + 0.4r = 0 (5 * 0.8 + r * 0.8) + 0.4r = 0 (4 + 0.8r) + 0.4r = 0 Combine like terms: 0.8r + 0.4r = 1.2r 4 + 1.2r = 0 Solving 4 + 1.2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 1.2r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 1.2r = 0 + -4 1.2r = 0 + -4 Combine like terms: 0 + -4 = -4 1.2r = -4 Divide each side by '1.2'. r = -3.333333333 Simplifying r = -3.333333333
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