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Simplifying 7(5 + r) = 21 (5 * 7 + r * 7) = 21 (35 + 7r) = 21 Solving 35 + 7r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + 7r = 21 + -35 Combine like terms: 35 + -35 = 0 0 + 7r = 21 + -35 7r = 21 + -35 Combine like terms: 21 + -35 = -14 7r = -14 Divide each side by '7'. r = -2 Simplifying r = -2
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