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Simplifying 2r + -4 + 2r = -9 Reorder the terms: -4 + 2r + 2r = -9 Combine like terms: 2r + 2r = 4r -4 + 4r = -9 Solving -4 + 4r = -9 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 + 4r = -9 + 4 Combine like terms: -4 + 4 = 0 0 + 4r = -9 + 4 4r = -9 + 4 Combine like terms: -9 + 4 = -5 4r = -5 Divide each side by '4'. r = -1.25 Simplifying r = -1.25
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