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Simplifying 7(12 + -1r) = -84 (12 * 7 + -1r * 7) = -84 (84 + -7r) = -84 Solving 84 + -7r = -84 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + -7r = -84 + -84 Combine like terms: 84 + -84 = 0 0 + -7r = -84 + -84 -7r = -84 + -84 Combine like terms: -84 + -84 = -168 -7r = -168 Divide each side by '-7'. r = 24 Simplifying r = 24
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