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Simplifying 3r + -3 = 9 Reorder the terms: -3 + 3r = 9 Solving -3 + 3r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3r = 9 + 3 Combine like terms: -3 + 3 = 0 0 + 3r = 9 + 3 3r = 9 + 3 Combine like terms: 9 + 3 = 12 3r = 12 Divide each side by '3'. r = 4 Simplifying r = 4
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