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Simplifying r + 4 + 6r = 18 Reorder the terms: 4 + r + 6r = 18 Combine like terms: r + 6r = 7r 4 + 7r = 18 Solving 4 + 7r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7r = 18 + -4 Combine like terms: 4 + -4 = 0 0 + 7r = 18 + -4 7r = 18 + -4 Combine like terms: 18 + -4 = 14 7r = 14 Divide each side by '7'. r = 2 Simplifying r = 2
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