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Simplifying 2r + -18 = 0 Reorder the terms: -18 + 2r = 0 Solving -18 + 2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 2r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + 2r = 0 + 18 2r = 0 + 18 Combine like terms: 0 + 18 = 18 2r = 18 Divide each side by '2'. r = 9 Simplifying r = 9
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