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