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Simplifying 4r + 4(r + 0.8) = 16.8 Reorder the terms: 4r + 4(0.8 + r) = 16.8 4r + (0.8 * 4 + r * 4) = 16.8 4r + (3.2 + 4r) = 16.8 Reorder the terms: 3.2 + 4r + 4r = 16.8 Combine like terms: 4r + 4r = 8r 3.2 + 8r = 16.8 Solving 3.2 + 8r = 16.8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3.2' to each side of the equation. 3.2 + -3.2 + 8r = 16.8 + -3.2 Combine like terms: 3.2 + -3.2 = 0.0 0.0 + 8r = 16.8 + -3.2 8r = 16.8 + -3.2 Combine like terms: 16.8 + -3.2 = 13.6 8r = 13.6 Divide each side by '8'. r = 1.7 Simplifying r = 1.7
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