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Simplifying -2r + 4r + -12 = 40 Reorder the terms: -12 + -2r + 4r = 40 Combine like terms: -2r + 4r = 2r -12 + 2r = 40 Solving -12 + 2r = 40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 2r = 40 + 12 Combine like terms: -12 + 12 = 0 0 + 2r = 40 + 12 2r = 40 + 12 Combine like terms: 40 + 12 = 52 2r = 52 Divide each side by '2'. r = 26 Simplifying r = 26
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