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Simplifying 3r + 7r + -21r + 3 + -6 = 0 Reorder the terms: 3 + -6 + 3r + 7r + -21r = 0 Combine like terms: 3 + -6 = -3 -3 + 3r + 7r + -21r = 0 Combine like terms: 3r + 7r = 10r -3 + 10r + -21r = 0 Combine like terms: 10r + -21r = -11r -3 + -11r = 0 Solving -3 + -11r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -11r = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -11r = 0 + 3 -11r = 0 + 3 Combine like terms: 0 + 3 = 3 -11r = 3 Divide each side by '-11'. r = -0.2727272727 Simplifying r = -0.2727272727
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