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Simplifying 12r + 9r + -16 = 0 Reorder the terms: -16 + 12r + 9r = 0 Combine like terms: 12r + 9r = 21r -16 + 21r = 0 Solving -16 + 21r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + 21r = 0 + 16 Combine like terms: -16 + 16 = 0 0 + 21r = 0 + 16 21r = 0 + 16 Combine like terms: 0 + 16 = 16 21r = 16 Divide each side by '21'. r = 0.7619047619 Simplifying r = 0.7619047619
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