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Simplifying 0.5(4 + r) = 10 (4 * 0.5 + r * 0.5) = 10 (2 + 0.5r) = 10 Solving 2 + 0.5r = 10 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 + 0.5r = 10 + -2 Combine like terms: 2 + -2 = 0 0 + 0.5r = 10 + -2 0.5r = 10 + -2 Combine like terms: 10 + -2 = 8 0.5r = 8 Divide each side by '0.5'. r = 16 Simplifying r = 16
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