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Simplifying 2r + -18 + 6 = 0 Reorder the terms: -18 + 6 + 2r = 0 Combine like terms: -18 + 6 = -12 -12 + 2r = 0 Solving -12 + 2r = 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 + 2r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 2r = 0 + 12 2r = 0 + 12 Combine like terms: 0 + 12 = 12 2r = 12 Divide each side by '2'. r = 6 Simplifying r = 6
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