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Simplifying 8(r + 78) = -16 Reorder the terms: 8(78 + r) = -16 (78 * 8 + r * 8) = -16 (624 + 8r) = -16 Solving 624 + 8r = -16 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-624' to each side of the equation. 624 + -624 + 8r = -16 + -624 Combine like terms: 624 + -624 = 0 0 + 8r = -16 + -624 8r = -16 + -624 Combine like terms: -16 + -624 = -640 8r = -640 Divide each side by '8'. r = -80 Simplifying r = -80
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