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Simplifying 7(3r + 5) = -7 Reorder the terms: 7(5 + 3r) = -7 (5 * 7 + 3r * 7) = -7 (35 + 21r) = -7 Solving 35 + 21r = -7 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 + 21r = -7 + -35 Combine like terms: 35 + -35 = 0 0 + 21r = -7 + -35 21r = -7 + -35 Combine like terms: -7 + -35 = -42 21r = -42 Divide each side by '21'. r = -2 Simplifying r = -2
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