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Simplifying r + -2 = -1r + 18 Reorder the terms: -2 + r = -1r + 18 Reorder the terms: -2 + r = 18 + -1r Solving -2 + r = 18 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -2 + r + r = 18 + -1r + r Combine like terms: r + r = 2r -2 + 2r = 18 + -1r + r Combine like terms: -1r + r = 0 -2 + 2r = 18 + 0 -2 + 2r = 18 Add '2' to each side of the equation. -2 + 2 + 2r = 18 + 2 Combine like terms: -2 + 2 = 0 0 + 2r = 18 + 2 2r = 18 + 2 Combine like terms: 18 + 2 = 20 2r = 20 Divide each side by '2'. r = 10 Simplifying r = 10
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