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Simplifying 2(7 + 3r) = -1r (7 * 2 + 3r * 2) = -1r (14 + 6r) = -1r Solving 14 + 6r = -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 14 + 6r + r = -1r + r Combine like terms: 6r + r = 7r 14 + 7r = -1r + r Combine like terms: -1r + r = 0 14 + 7r = 0 Add '-14' to each side of the equation. 14 + -14 + 7r = 0 + -14 Combine like terms: 14 + -14 = 0 0 + 7r = 0 + -14 7r = 0 + -14 Combine like terms: 0 + -14 = -14 7r = -14 Divide each side by '7'. r = -2 Simplifying r = -2
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