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Simplifying 3r + -12 = 9 Reorder the terms: -12 + 3r = 9 Solving -12 + 3r = 9 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 = 9 + 12 Combine like terms: -12 + 12 = 0 0 + 3r = 9 + 12 3r = 9 + 12 Combine like terms: 9 + 12 = 21 3r = 21 Divide each side by '3'. r = 7 Simplifying r = 7
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