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Simplifying D + -2(4 + d) = 4 D + (4 * -2 + d * -2) = 4 D + (-8 + -2d) = 4 Reorder the terms: -8 + D + -2d = 4 Solving -8 + D + -2d = 4 Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '8' to each side of the equation. -8 + D + 8 + -2d = 4 + 8 Reorder the terms: -8 + 8 + D + -2d = 4 + 8 Combine like terms: -8 + 8 = 0 0 + D + -2d = 4 + 8 D + -2d = 4 + 8 Combine like terms: 4 + 8 = 12 D + -2d = 12 Add '2d' to each side of the equation. D + -2d + 2d = 12 + 2d Combine like terms: -2d + 2d = 0 D + 0 = 12 + 2d D = 12 + 2d Simplifying D = 12 + 2d
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