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Simplifying 2r + -4 + 2 = 18 Reorder the terms: -4 + 2 + 2r = 18 Combine like terms: -4 + 2 = -2 -2 + 2r = 18 Solving -2 + 2r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 2r = 18 + 2 Combine like terms: -2 + 2 = 0 0 + 2r = 18 + 2 2r = 18 + 2 Combine like terms: 18 + 2 = 20 2r = 20 Divide each side by '2'. r = 10 Simplifying r = 10
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