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Simplifying 3r + 6 = 21 Reorder the terms: 6 + 3r = 21 Solving 6 + 3r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 3r = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 3r = 21 + -6 3r = 21 + -6 Combine like terms: 21 + -6 = 15 3r = 15 Divide each side by '3'. r = 5 Simplifying r = 5
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