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Simplifying -13r + 15r + 5r + -8r + 1 = -10 Reorder the terms: 1 + -13r + 15r + 5r + -8r = -10 Combine like terms: -13r + 15r = 2r 1 + 2r + 5r + -8r = -10 Combine like terms: 2r + 5r = 7r 1 + 7r + -8r = -10 Combine like terms: 7r + -8r = -1r 1 + -1r = -10 Solving 1 + -1r = -10 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 + -1r = -10 + -1 Combine like terms: 1 + -1 = 0 0 + -1r = -10 + -1 -1r = -10 + -1 Combine like terms: -10 + -1 = -11 -1r = -11 Divide each side by '-1'. r = 11 Simplifying r = 11
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