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Simplifying 3(r + 1) + 4 = 19 Reorder the terms: 3(1 + r) + 4 = 19 (1 * 3 + r * 3) + 4 = 19 (3 + 3r) + 4 = 19 Reorder the terms: 3 + 4 + 3r = 19 Combine like terms: 3 + 4 = 7 7 + 3r = 19 Solving 7 + 3r = 19 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3r = 19 + -7 Combine like terms: 7 + -7 = 0 0 + 3r = 19 + -7 3r = 19 + -7 Combine like terms: 19 + -7 = 12 3r = 12 Divide each side by '3'. r = 4 Simplifying r = 4
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