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Simplifying -7(r + -6) = 84 Reorder the terms: -7(-6 + r) = 84 (-6 * -7 + r * -7) = 84 (42 + -7r) = 84 Solving 42 + -7r = 84 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + -7r = 84 + -42 Combine like terms: 42 + -42 = 0 0 + -7r = 84 + -42 -7r = 84 + -42 Combine like terms: 84 + -42 = 42 -7r = 42 Divide each side by '-7'. r = -6 Simplifying r = -6
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