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Simplifying 20r + 3r + -18r + -3r + -2 = 8 Reorder the terms: -2 + 20r + 3r + -18r + -3r = 8 Combine like terms: 20r + 3r = 23r -2 + 23r + -18r + -3r = 8 Combine like terms: 23r + -18r = 5r -2 + 5r + -3r = 8 Combine like terms: 5r + -3r = 2r -2 + 2r = 8 Solving -2 + 2r = 8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 2r = 8 + 2 Combine like terms: -2 + 2 = 0 0 + 2r = 8 + 2 2r = 8 + 2 Combine like terms: 8 + 2 = 10 2r = 10 Divide each side by '2'. r = 5 Simplifying r = 5
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