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Simplifying r + 5r + 5 = -21 Reorder the terms: 5 + r + 5r = -21 Combine like terms: r + 5r = 6r 5 + 6r = -21 Solving 5 + 6r = -21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 6r = -21 + -5 Combine like terms: 5 + -5 = 0 0 + 6r = -21 + -5 6r = -21 + -5 Combine like terms: -21 + -5 = -26 6r = -26 Divide each side by '6'. r = -4.333333333 Simplifying r = -4.333333333
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