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Simplifying 4r + 6r + 3r + -4 = 0 Reorder the terms: -4 + 4r + 6r + 3r = 0 Combine like terms: 4r + 6r = 10r -4 + 10r + 3r = 0 Combine like terms: 10r + 3r = 13r -4 + 13r = 0 Solving -4 + 13r = 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 + 13r = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 13r = 0 + 4 13r = 0 + 4 Combine like terms: 0 + 4 = 4 13r = 4 Divide each side by '13'. r = 0.3076923077 Simplifying r = 0.3076923077
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