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Simplifying 7r + -6 + 14 = -76 + 21r Reorder the terms: -6 + 14 + 7r = -76 + 21r Combine like terms: -6 + 14 = 8 8 + 7r = -76 + 21r Solving 8 + 7r = -76 + 21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21r' to each side of the equation. 8 + 7r + -21r = -76 + 21r + -21r Combine like terms: 7r + -21r = -14r 8 + -14r = -76 + 21r + -21r Combine like terms: 21r + -21r = 0 8 + -14r = -76 + 0 8 + -14r = -76 Add '-8' to each side of the equation. 8 + -8 + -14r = -76 + -8 Combine like terms: 8 + -8 = 0 0 + -14r = -76 + -8 -14r = -76 + -8 Combine like terms: -76 + -8 = -84 -14r = -84 Divide each side by '-14'. r = 6 Simplifying r = 6
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