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Simplifying 3(5r + 4) = 28 Reorder the terms: 3(4 + 5r) = 28 (4 * 3 + 5r * 3) = 28 (12 + 15r) = 28 Solving 12 + 15r = 28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 15r = 28 + -12 Combine like terms: 12 + -12 = 0 0 + 15r = 28 + -12 15r = 28 + -12 Combine like terms: 28 + -12 = 16 15r = 16 Divide each side by '15'. r = 1.066666667 Simplifying r = 1.066666667
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