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Simplifying 4 + 3r + 8 = 0 Reorder the terms: 4 + 8 + 3r = 0 Combine like terms: 4 + 8 = 12 12 + 3r = 0 Solving 12 + 3r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3r = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 3r = 0 + -12 3r = 0 + -12 Combine like terms: 0 + -12 = -12 3r = -12 Divide each side by '3'. r = -4 Simplifying r = -4
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