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Simplifying 10r + 10(r + 0.4) = 20 Reorder the terms: 10r + 10(0.4 + r) = 20 10r + (0.4 * 10 + r * 10) = 20 10r + (4 + 10r) = 20 Reorder the terms: 4 + 10r + 10r = 20 Combine like terms: 10r + 10r = 20r 4 + 20r = 20 Solving 4 + 20r = 20 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 + 20r = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 20r = 20 + -4 20r = 20 + -4 Combine like terms: 20 + -4 = 16 20r = 16 Divide each side by '20'. r = 0.8 Simplifying r = 0.8
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