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Simplifying 7r + 23 + -4r = -55 Reorder the terms: 23 + 7r + -4r = -55 Combine like terms: 7r + -4r = 3r 23 + 3r = -55 Solving 23 + 3r = -55 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-23' to each side of the equation. 23 + -23 + 3r = -55 + -23 Combine like terms: 23 + -23 = 0 0 + 3r = -55 + -23 3r = -55 + -23 Combine like terms: -55 + -23 = -78 3r = -78 Divide each side by '3'. r = -26 Simplifying r = -26
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