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Simplifying 2(d + -1) = -4 Reorder the terms: 2(-1 + d) = -4 (-1 * 2 + d * 2) = -4 (-2 + 2d) = -4 Solving -2 + 2d = -4 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 2d = -4 + 2 Combine like terms: -2 + 2 = 0 0 + 2d = -4 + 2 2d = -4 + 2 Combine like terms: -4 + 2 = -2 2d = -2 Divide each side by '2'. d = -1 Simplifying d = -1
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