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Simplifying -18 = 5 + -2r + 12 Reorder the terms: -18 = 5 + 12 + -2r Combine like terms: 5 + 12 = 17 -18 = 17 + -2r Solving -18 = 17 + -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 = 17 + -2r + 2r Combine like terms: -2r + 2r = 0 -18 + 2r = 17 + 0 -18 + 2r = 17 Add '18' to each side of the equation. -18 + 18 + 2r = 17 + 18 Combine like terms: -18 + 18 = 0 0 + 2r = 17 + 18 2r = 17 + 18 Combine like terms: 17 + 18 = 35 2r = 35 Divide each side by '2'. r = 17.5 Simplifying r = 17.5
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