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Simplifying 7r + 2r + -4 = 0 Reorder the terms: -4 + 7r + 2r = 0 Combine like terms: 7r + 2r = 9r -4 + 9r = 0 Solving -4 + 9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 9r = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 9r = 0 + 4 9r = 0 + 4 Combine like terms: 0 + 4 = 4 9r = 4 Divide each side by '9'. r = 0.4444444444 Simplifying r = 0.4444444444
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