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Simplifying 13 + -1r = -8r + -6r Combine like terms: -8r + -6r = -14r 13 + -1r = -14r Solving 13 + -1r = -14r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14r' to each side of the equation. 13 + -1r + 14r = -14r + 14r Combine like terms: -1r + 14r = 13r 13 + 13r = -14r + 14r Combine like terms: -14r + 14r = 0 13 + 13r = 0 Add '-13' to each side of the equation. 13 + -13 + 13r = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 13r = 0 + -13 13r = 0 + -13 Combine like terms: 0 + -13 = -13 13r = -13 Divide each side by '13'. r = -1 Simplifying r = -1
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