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Simplifying 20 = 0.5r + -10 Reorder the terms: 20 = -10 + 0.5r Solving 20 = -10 + 0.5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.5r' to each side of the equation. 20 + -0.5r = -10 + 0.5r + -0.5r Combine like terms: 0.5r + -0.5r = 0.0 20 + -0.5r = -10 + 0.0 20 + -0.5r = -10 Add '-20' to each side of the equation. 20 + -20 + -0.5r = -10 + -20 Combine like terms: 20 + -20 = 0 0 + -0.5r = -10 + -20 -0.5r = -10 + -20 Combine like terms: -10 + -20 = -30 -0.5r = -30 Divide each side by '-0.5'. r = 60 Simplifying r = 60
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