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Simplifying -20.4r + 4(1 + 5r) = 4.8 -20.4r + (1 * 4 + 5r * 4) = 4.8 -20.4r + (4 + 20r) = 4.8 Reorder the terms: 4 + -20.4r + 20r = 4.8 Combine like terms: -20.4r + 20r = -0.4r 4 + -0.4r = 4.8 Solving 4 + -0.4r = 4.8 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 + -0.4r = 4.8 + -4 Combine like terms: 4 + -4 = 0 0 + -0.4r = 4.8 + -4 -0.4r = 4.8 + -4 Combine like terms: 4.8 + -4 = 0.8 -0.4r = 0.8 Divide each side by '-0.4'. r = -2 Simplifying r = -2
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