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Simplifying 7(r + -1(-5)) = 7 Multiply -1 * -5 7(r + 5) = 7 Reorder the terms: 7(5 + r) = 7 (5 * 7 + r * 7) = 7 (35 + 7r) = 7 Solving 35 + 7r = 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 + 7r = 7 + -35 Combine like terms: 35 + -35 = 0 0 + 7r = 7 + -35 7r = 7 + -35 Combine like terms: 7 + -35 = -28 7r = -28 Divide each side by '7'. r = -4 Simplifying r = -4
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