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Simplifying 19r + 2r + -1r + -18r + 2 = 20 Reorder the terms: 2 + 19r + 2r + -1r + -18r = 20 Combine like terms: 19r + 2r = 21r 2 + 21r + -1r + -18r = 20 Combine like terms: 21r + -1r = 20r 2 + 20r + -18r = 20 Combine like terms: 20r + -18r = 2r 2 + 2r = 20 Solving 2 + 2r = 20 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 = 20 + -2 Combine like terms: 2 + -2 = 0 0 + 2r = 20 + -2 2r = 20 + -2 Combine like terms: 20 + -2 = 18 2r = 18 Divide each side by '2'. r = 9 Simplifying r = 9
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