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Simplifying (6r + 7) + (13 + 7r) = 1 Reorder the terms: (7 + 6r) + (13 + 7r) = 1 Remove parenthesis around (7 + 6r) 7 + 6r + (13 + 7r) = 1 Remove parenthesis around (13 + 7r) 7 + 6r + 13 + 7r = 1 Reorder the terms: 7 + 13 + 6r + 7r = 1 Combine like terms: 7 + 13 = 20 20 + 6r + 7r = 1 Combine like terms: 6r + 7r = 13r 20 + 13r = 1 Solving 20 + 13r = 1 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 13r = 1 + -20 Combine like terms: 20 + -20 = 0 0 + 13r = 1 + -20 13r = 1 + -20 Combine like terms: 1 + -20 = -19 13r = -19 Divide each side by '13'. r = -1.461538462 Simplifying r = -1.461538462
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