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Simplifying 3r + 7 = -8 Reorder the terms: 7 + 3r = -8 Solving 7 + 3r = -8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3r = -8 + -7 Combine like terms: 7 + -7 = 0 0 + 3r = -8 + -7 3r = -8 + -7 Combine like terms: -8 + -7 = -15 3r = -15 Divide each side by '3'. r = -5 Simplifying r = -5
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