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Simplifying 5r + 4(r + 3) = 66 Reorder the terms: 5r + 4(3 + r) = 66 5r + (3 * 4 + r * 4) = 66 5r + (12 + 4r) = 66 Reorder the terms: 12 + 5r + 4r = 66 Combine like terms: 5r + 4r = 9r 12 + 9r = 66 Solving 12 + 9r = 66 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 + 9r = 66 + -12 Combine like terms: 12 + -12 = 0 0 + 9r = 66 + -12 9r = 66 + -12 Combine like terms: 66 + -12 = 54 9r = 54 Divide each side by '9'. r = 6 Simplifying r = 6
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