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Simplifying 19 = 5(r + 8) Reorder the terms: 19 = 5(8 + r) 19 = (8 * 5 + r * 5) 19 = (40 + 5r) Solving 19 = 40 + 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. 19 + -5r = 40 + 5r + -5r Combine like terms: 5r + -5r = 0 19 + -5r = 40 + 0 19 + -5r = 40 Add '-19' to each side of the equation. 19 + -19 + -5r = 40 + -19 Combine like terms: 19 + -19 = 0 0 + -5r = 40 + -19 -5r = 40 + -19 Combine like terms: 40 + -19 = 21 -5r = 21 Divide each side by '-5'. r = -4.2 Simplifying r = -4.2
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