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Simplifying 15 = 1 + -7r + -7r Combine like terms: -7r + -7r = -14r 15 = 1 + -14r Solving 15 = 1 + -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. 15 + 14r = 1 + -14r + 14r Combine like terms: -14r + 14r = 0 15 + 14r = 1 + 0 15 + 14r = 1 Add '-15' to each side of the equation. 15 + -15 + 14r = 1 + -15 Combine like terms: 15 + -15 = 0 0 + 14r = 1 + -15 14r = 1 + -15 Combine like terms: 1 + -15 = -14 14r = -14 Divide each side by '14'. r = -1 Simplifying r = -1
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