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Simplifying 4r + 8 = 7.2 + 5r Reorder the terms: 8 + 4r = 7.2 + 5r Solving 8 + 4r = 7.2 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 8 + 4r + -5r = 7.2 + 5r + -5r Combine like terms: 4r + -5r = -1r 8 + -1r = 7.2 + 5r + -5r Combine like terms: 5r + -5r = 0 8 + -1r = 7.2 + 0 8 + -1r = 7.2 Add '-8' to each side of the equation. 8 + -8 + -1r = 7.2 + -8 Combine like terms: 8 + -8 = 0 0 + -1r = 7.2 + -8 -1r = 7.2 + -8 Combine like terms: 7.2 + -8 = -0.8 -1r = -0.8 Divide each side by '-1'. r = 0.8 Simplifying r = 0.8
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