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Simplifying -6r + 1 + -13r = 18 Reorder the terms: 1 + -6r + -13r = 18 Combine like terms: -6r + -13r = -19r 1 + -19r = 18 Solving 1 + -19r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -19r = 18 + -1 Combine like terms: 1 + -1 = 0 0 + -19r = 18 + -1 -19r = 18 + -1 Combine like terms: 18 + -1 = 17 -19r = 17 Divide each side by '-19'. r = -0.8947368421 Simplifying r = -0.8947368421
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