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Simplifying 4r + -2(r + 1) = 18 Reorder the terms: 4r + -2(1 + r) = 18 4r + (1 * -2 + r * -2) = 18 4r + (-2 + -2r) = 18 Reorder the terms: -2 + 4r + -2r = 18 Combine like terms: 4r + -2r = 2r -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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